Coretox Masseter Reduction in Seoul: Non-Surgical Facial Slimming for Narrower Jawline at Rappoel Dermatology Gangnam<\/title><br \/>\n<meta name=\"description\" content=\"Enlarged masseter muscles making your face square and wide? Rappoel Dermatology uses Korea's Coretox botulinum toxin to precisely inject the masseter \u2014 non-surgical safe jawline slimming with visible results in 2 weeks and optimal effect at 1 month\">\n<link rel=\"alternate\" hreflang=\"en\" href=\"https:\/\/rappoel-clinic.com\/coretox-masseter-reduction-en-2\/\" \/>\n<link rel=\"alternate\" hreflang=\"zh-TW\" href=\"https:\/\/rappoel-clinic.com\/coretox-masseter-reduction-zh-2\/\" \/>\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"MedicalClinic\", \"@id\": \"https:\/\/rappoel-clinic.com\/#clinic\", \"name\": \"Rappoel Dermatology Clinic\", \"alternateName\": [\"Rappoel \u76ae\u819a\u79d1\", \"\ub77c\ud3ec\uc5d8 \ud53c\ubd80\uacfc\"], \"url\": \"https:\/\/rappoel-clinic.com\", \"address\": {\"@type\": \"PostalAddress\", \"streetAddress\": \"77, Seocho-daero\", \"addressLocality\": \"Seocho-gu\", \"addressRegion\": \"Seoul\", \"postalCode\": \"06609\", \"addressCountry\": \"KR\"}, \"geo\": {\"@type\": \"GeoCoordinates\", \"latitude\": 37.4926, \"longitude\": 127.0175}, \"telephone\": \"+82-2-XXXX-XXXX\", \"openingHours\": [\"Mo-Fr 10:00-19:00\", \"Sa 10:00-17:00\"], \"medicalSpecialty\": \"Dermatology\", \"availableService\": [{\"@type\": \"MedicalProcedure\", \"name\": \"Thread Lift (Aptos)\"}, {\"@type\": \"MedicalProcedure\", \"name\": \"Hyaluronic Acid Filler\"}, {\"@type\": \"MedicalProcedure\", \"name\": \"Botulinum Toxin (Botox)\"}, {\"@type\": \"MedicalProcedure\", \"name\": \"Ultherapy \/ HIFU\"}, {\"@type\": \"MedicalProcedure\", \"name\": \"Skin Booster (Juvelook \/ Exosomes)\"}, {\"@type\": \"MedicalProcedure\", \"name\": \"Laser Skin Treatment\"}, {\"@type\": \"MedicalProcedure\", \"name\": \"Onda Coolwaves Body Contouring\"}], \"sameAs\": [\"https:\/\/www.instagram.com\/rappoel_official\"]}<\/script><br \/>\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"Article\", \"headline\": \"Coretox Masseter Reduction in Seoul: Non-Surgical Facial Slimming for Narrower Jawline at Rappoel Dermatology Gangnam\", \"description\": \"Enlarged masseter muscles making your face square and wide? Rappoel Dermatology uses Korea's Coretox botulinum toxin to precisely inject the masseter \u2014 non-surgical safe jawline slimming with visible results in 2 weeks and optimal effect at 1 month\", \"inLanguage\": \"en\", \"author\": {\"@type\": \"Organization\", \"name\": \"Rappoel Dermatology Clinic\"}, \"publisher\": {\"@type\": \"Organization\", \"name\": \"Rappoel Dermatology Clinic\", \"logo\": {\"@type\": \"ImageObject\", \"url\": \"https:\/\/rappoel-clinic.com\/wp-content\/uploads\/2026\/04\/favicon-512.png\"}}, \"about\": {\"@id\": \"https:\/\/rappoel-clinic.com\/#clinic\"}}<\/script><br \/>\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How much smaller will my face get with masseter Botox? Is the effect noticeable?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The slimming effect depends on masseter hypertrophy degree and injection dosage: (1) Mild hypertrophy \u2014 facial width reduces by approximately 3-5mm at 1 month, subtle shift from square toward oval. (2) Moderate hypertrophy \u2014 5-8mm reduction, noticeable decrease in mandibular angle width, significant frontal change. (3) Severe hypertrophy \u2014 8-12mm reduction, dramatic change from obviously square to near-oval. Note: masseter Botox reduces muscle volume, not bone \u2014 if your square face also has wide mandibular bone (skeletal square face), Botox only reduces the muscle component; skeletal reduction requires orthognathic surgery or mandibular angle ostectomy. Rappoel physicians distinguish between muscular and skeletal square faces during assessment \u2014 muscular type responds dramatically to Botox; skeletal type may need combined surgical approach.\"}}, {\"@type\": \"Question\", \"name\": \"How long does masseter Botox last? Will it stop working over time?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Masseter Botox typically lasts 4-6 months \u2014 because the neuromuscular junction gradually regenerates acetylcholine receptors restoring muscle contraction, and muscle volume recovers accordingly. However, an important phenomenon: after each injection, the masseter cannot perform high-intensity chewing during the atrophy period \u2014 equivalent to passive exercise reduction. Many patients find that after 3-5 regular sessions, the masseter's baseline volume is smaller than initially \u2014 even when Botox effect fades, the face doesn't completely return to the original square shape. Regarding resistance: long-term repeated Botox injections may produce neutralizing antibodies causing diminished effect \u2014 incidence approximately 1-5%. Coretox's high-purity formulation theoretically reduces antibody risk. Rappoel recommends: minimum 3-month intervals between injections, lowest effective dose, scientifically managed frequency to minimize resistance risk.\"}}, {\"@type\": \"Question\", \"name\": \"Will masseter Botox cause chewing weakness? Does it affect eating?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Mild chewing strength decrease may occur post-injection \u2014 particularly at 2-4 weeks when the effect is strongest, biting hard objects may feel effortful. But this is temporary and controllable: (1) Rappoel uses moderate dosage (25-40 units per side) \u2014 not completely freezing masseter function, only reducing 20-30% of contraction force. Normal eating is completely unaffected. (2) Chewing is primarily driven by the deep masseter and medial pterygoid \u2014 Rappoel's injection targets mainly the superficial and middle layers, preserving deep function. (3) If significant chewing weakness occurs (usually from excessive dosage), the dose is reduced at the next session. Precautions: avoid particularly hard foods (nuts, hard candy) for 1 week post-injection, letting the masseter atrophy proceed without extra stimulation. The vast majority of patients eat normally without impact \u2014 only finding very hard items slightly more effortful than before.\"}}, {\"@type\": \"Question\", \"name\": \"What is the difference between Coretox and Botox for masseter reduction?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Coretox and Botox are both botulinum toxin type A with the same core mechanism, with these main differences: (1) Purity \u2014 Coretox is 150kDa high-purity toxin with complex proteins removed; Botox is 900kDa complex. (2) Onset speed \u2014 Coretox averages 2-3 days; Botox typically 5-7 days. For masseter reduction, Coretox may show muscle slimming at 5-7 days, while Botox takes 10-14 days. (3) Diffusion range \u2014 Coretox has smaller diffusion, safer for masseter injection (reduced risk of spreading to lateral pterygoid affecting mouth opening). (4) Formulation \u2014 Coretox contains no animal-derived proteins or albumin, lower allergy risk. (5) Supply \u2014 Coretox is domestically produced in Korea with stable supply. Both last similarly (4-6 months) with similar slimming effects. Rappoel selects based on patient needs \u2014 Coretox recommended for those wanting fast results or experiencing diminished Botox effect.\"}}, {\"@type\": \"Question\", \"name\": \"Can masseter Botox be combined with chin filler? Is the V-line effect good?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Highly recommended \u2014 masseter reduction + chin filler is the golden combination for V-line facial contouring: (1) Complementary effects \u2014 Botox reduces masseter to decrease mandibular angle width (narrowing the face), HA filler extends the chin (lengthening and pointing the face), synergistically achieving a narrow + long + pointed V-line. (2) Same-day treatment \u2014 the two target completely different areas (masseter at bilateral mandibular angles vs chin at the mandibular center), non-interfering. (3) Effect timeline \u2014 HA is instant (immediate chin extension visible), Botox takes 2-4 weeks (gradual face narrowing), with combined optimal V-line effect at 1 month. (4) The combination is far superior to either alone \u2014 masseter Botox alone only narrows but doesn't lengthen (may make the face appear shorter); chin filler alone only lengthens but doesn't narrow (a square face with chin filler may look even more square); the combination addresses both width and length. Rappoel's V-line comprehensive plan is based on this principle \u2014 the most cost-effective non-surgical V-line solution.\"}}]}<\/script><\/p>\n<style>\n*{box-sizing:border-box;margin:0;padding:0}\nbody{font-family:'PingFang SC','Noto Sans KR',sans-serif;background:#fffcf7;color:#3d2e1e;line-height:1.8}\n.wrap{max-width:677px;margin:0 auto;padding:32px 20px 60px}\n.banner{background:#FFF8EC;text-align:center;padding:36px 20px 28px;margin-bottom:36px;border-bottom:1px solid #e8d5c0}\n.banner-tag{font-size:11px;letter-spacing:3px;color:#8B7355;text-transform:uppercase;margin-bottom:12px}\n.banner h1{font-size:24px;color:#3d2e1e;line-height:1.4;margin-bottom:12px}\n.banner .sub{font-size:13px;color:#6b5240;line-height:1.7}\nh2{font-size:19px;color:#3d2e1e;margin:32px 0 14px;padding-bottom:8px;border-bottom:1px solid #e8d5c0}\nh3{font-size:16px;color:#3d2e1e;margin:22px 0 10px}\np{font-size:15px;color:#555;line-height:1.9;margin-bottom:14px}\n.highlight{background:#fff;border:1px solid #f0e8dc;border-left:3px solid #D4A574;padding:16px 20px;margin:22px 0;border-radius:0 6px 6px 0}\n.highlight p{margin:0;font-size:14px;color:#6b5240}\n.card{background:#F5E6C8;border:1px solid #e8d5c0;border-radius:8px;padding:18px 22px;margin:16px 0}\n.card-title{font-size:13px;font-weight:700;color:#3d2e1e;margin-bottom:6px}\n.card p{font-size:14px;margin:0}\n.faq-item{margin:14px 0;border-bottom:1px solid #f0e8dc;padding-bottom:14px}\n.faq-q{font-weight:700;color:#3d2e1e;font-size:15px;margin-bottom:6px}\n.faq-a{font-size:14px;color:#555;line-height:1.8}\n.cta{background:#F5E6C8;text-align:center;padding:32px 20px;margin-top:40px;border-radius:8px}\n.cta h3{font-size:17px;color:#3d2e1e;margin-bottom:8px}\n.cta p{font-size:13px;color:#6b5240;margin-bottom:4px}\nimg{max-width:100%;height:auto;display:block;margin:20px auto;border-radius:6px}\nul,ol{padding-left:22px;margin-bottom:14px}\nli{font-size:15px;color:#555;line-height:1.9;margin-bottom:4px}\n.schema-block{display:none}\n@media(max-width:600px){.wrap{padding:20px 14px 40px}.banner h1{font-size:20px}}\n<\/style>\n<p><\/head><br \/>\n<body><\/p>\n<div class=\"wrap\">\n<div class=\"banner\">\n<div class=\"banner-tag\">Botox<\/div>\n<h1>Coretox Masseter Reduction in Seoul: Non-Surgical Facial Slimming for Narrower Jawline at Rappoel Dermatology Gangnam<\/h1>\n<div class=\"sub\">Enlarged masseter muscles making your face square and wide? Rappoel Dermatology uses Korea’s Coretox botulinum toxin to precisely inject the masseter \u2014 non-surgical safe jawline slimming with visible results in 2 weeks and optimal effect at 1 month<\/div>\n<\/p><\/div>\n<p>The masseter muscle is the primary muscle among the masticatory muscle group located in the mandibular angle area on both sides of the face \u2014 it originates from the lower border and medial surface of the zygomatic arch and inserts on the mandibular angle and lateral ramus. The masseter functions in jaw closure and chewing \u2014 when we clench our teeth, the bulging muscle masses at the mandibular angles are clearly palpable. Masseter hypertrophy is a common facial concern among East Asian populations, particularly East Asian women \u2014 enlarged masseters make the mandibular angle area noticeably wide, creating a square or trapezoidal face shape rather than the ideal oval or V-line. Causes of masseter hypertrophy include: (1) Genetics \u2014 some people naturally have larger masseter volume and thicker muscle fibers. (2) Chewing habits \u2014 long-term preference for hard foods (nuts, jerky, dried squid), frequent gum or betel nut chewing overdevelops the masseter. (3) Bruxism \u2014 unconscious teeth clenching during sleep causes sustained high-intensity masseter contraction, leading to compensatory hypertrophy over time. (4) Stress-related clenching \u2014 unconscious jaw clenching during mental tension. (5) Unilateral chewing \u2014 long-term preferential chewing on one side makes that masseter more developed, causing facial asymmetry. Rappoel Dermatology near Gangnam Station, Seoul, uses Korea’s Coretox botulinum toxin \u2014 precisely injecting the masseter for selective muscle atrophy and reduction, providing a safe, effective, non-surgical facial slimming solution.<\/p>\n<h2>Technical Principles of Coretox Masseter Reduction<\/h2>\n<ul>\n<li><strong>Botulinum toxin selective muscle atrophy mechanism:<\/strong> Coretox is botulinum toxin type A \u2014 when injected into the masseter, it blocks acetylcholine release at the neuromuscular junction, causing masseter muscle fibers to lose neural stimulation and enter a state of disuse atrophy. Muscle fibers gradually thin and volume decreases \u2014 clinical data shows masseter volume reduces by an average of 20-30% at 4-6 weeks post-injection, reaching maximum atrophy of approximately 30-40% at 3 months<\/li>\n<li><strong>Coretox Korean-origin purity advantage:<\/strong> Coretox is a 150kDa high-purity toxin developed by Daewoong Pharmaceutical \u2014 unnecessary complex proteins removed, theoretically reducing antibody formation and resistance risk. For patients requiring long-term repeated injections (masseter reduction typically needs 2-3 sessions per year for maintenance), the high-purity formulation is more beneficial for maintaining consistent long-term results<\/li>\n<li><strong>Faster onset (3-5 days):<\/strong> Coretox clinical data shows average onset of 2-3 days \u2014 masseter area effects begin appearing at 7-10 days (muscle starts relaxing), preliminary slimming visible at 2 weeks, optimal results at 4-6 weeks<\/li>\n<li><strong>Precise diffusion control:<\/strong> The most critical safety consideration in masseter injection is preventing toxin spread to surrounding muscles \u2014 particularly the deep lateral pterygoid (spread may affect mouth opening) and superficial risorius (spread may affect smiling). Coretox’s smaller diffusion range makes it safer for masseter injection<\/li>\n<li><strong>Preservative-free hypoallergenic formulation:<\/strong> Coretox contains no animal-derived proteins or human serum albumin \u2014 reducing allergic reaction risk, suitable for sensitive patients requiring long-term repeated injections<\/li>\n<\/ul>\n<h2>Detailed Anatomy and Safety for Masseter Injection<\/h2>\n<ul>\n<li><strong>Masseter three-layer anatomy:<\/strong> The masseter has superficial, middle, and deep layers \u2014 the superficial layer is largest and thickest (the primary injection target), while middle and deep layers are smaller. Injection targets mainly the superficial and middle layers \u2014 deep injection is high-risk (near the lateral pterygoid and facial nerve branches)<\/li>\n<li><strong>Safe injection zone marking:<\/strong> Rappoel physicians have patients clench to mark the masseter bulge \u2014 injection points are strictly within: upper boundary below the tragus-to-mouth-corner line, lower boundary 1.5cm above the mandibular inferior border, anterior boundary at the masseter anterior edge, posterior boundary pre-auricular. 3-5 injection points per side distributed evenly<\/li>\n<li><strong>Avoiding parotid duct and facial nerve:<\/strong> The parotid duct crosses the masseter surface (approximately 1cm below the zygomatic arch, parallel to it) with facial nerve buccal branches \u2014 injection needles angle downward into the muscle, avoiding the superficial parotid duct and nerve<\/li>\n<li><strong>Precise dose distribution:<\/strong> Total Coretox per side: 25-40 units (adjusted for masseter volume) \u2014 divided across 3-5 points, 5-15 units each. Too low yields insufficient effect; too high may cause chewing weakness<\/li>\n<li><strong>Avoiding asymmetry:<\/strong> Most people have asymmetric masseter size (related to unilateral chewing habits) \u2014 physicians measure bilateral masseter thickness before injection, adjusting dosage distribution based on asymmetry<\/li>\n<\/ul>\n<h2>Rappoel Masseter Botox Injection Treatment Protocol<\/h2>\n<ol>\n<li><strong>Facial assessment and plan design (10 min):<\/strong> Frontal and side evaluation of mandibular angle width \u2192 patient clenches to assess masseter bulge and thickness \u2192 evaluate facial symmetry \u2192 confirm no special conditions like bruxism \u2192 establish injection plan (points, dosage, bilateral distribution)<\/li>\n<li><strong>Disinfection preparation (5 min):<\/strong> Facial cleansing \u2192 povidone-iodine bilateral mandibular angle preparation \u2192 mark injection points<\/li>\n<li><strong>Precise injection (8-10 min):<\/strong> 30G ultra-fine needle \u2192 3-5 injection points per side \u2192 injection depth within the masseter muscle belly (approximately 1-1.5cm deep) \u2192 5-15 units Coretox per point \u2192 immediate gentle pressure for hemostasis<\/li>\n<li><strong>Immediate assessment and guidance (5 min):<\/strong> Patient performs clenching and mouth opening to confirm normal function \u2192 post-care instructions (avoid pressing injection area, avoid lying flat for 4 hours, etc.) \u2192 2-week follow-up scheduled for effect evaluation<\/li>\n<\/ol>\n<p>The entire masseter Coretox injection takes about 20-25 minutes, with onset at 7-10 days, preliminary slimming at 2 weeks, optimal results at 4-6 weeks, lasting 4-6 months. Located 3 minutes from Gangnam Station Exit 10, with seamless English and Chinese consultation.<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<div class=\"faq-item\">\n<div class=\"faq-q\">How much smaller will my face get with masseter Botox? Is the effect noticeable?<\/div>\n<div class=\"faq-a\">The slimming effect depends on masseter hypertrophy degree and injection dosage: (1) Mild hypertrophy \u2014 facial width reduces by approximately 3-5mm at 1 month, subtle shift from square toward oval. (2) Moderate hypertrophy \u2014 5-8mm reduction, noticeable decrease in mandibular angle width, significant frontal change. (3) Severe hypertrophy \u2014 8-12mm reduction, dramatic change from obviously square to near-oval. Note: masseter Botox reduces muscle volume, not bone \u2014 if your square face also has wide mandibular bone (skeletal square face), Botox only reduces the muscle component; skeletal reduction requires orthognathic surgery or mandibular angle ostectomy. Rappoel physicians distinguish between muscular and skeletal square faces during assessment \u2014 muscular type responds dramatically to Botox; skeletal type may need combined surgical approach.<\/div>\n<\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">How long does masseter Botox last? Will it stop working over time?<\/div>\n<div class=\"faq-a\">Masseter Botox typically lasts 4-6 months \u2014 because the neuromuscular junction gradually regenerates acetylcholine receptors restoring muscle contraction, and muscle volume recovers accordingly. However, an important phenomenon: after each injection, the masseter cannot perform high-intensity chewing during the atrophy period \u2014 equivalent to passive exercise reduction. Many patients find that after 3-5 regular sessions, the masseter’s baseline volume is smaller than initially \u2014 even when Botox effect fades, the face doesn’t completely return to the original square shape. Regarding resistance: long-term repeated Botox injections may produce neutralizing antibodies causing diminished effect \u2014 incidence approximately 1-5%. Coretox’s high-purity formulation theoretically reduces antibody risk. Rappoel recommends: minimum 3-month intervals between injections, lowest effective dose, scientifically managed frequency to minimize resistance risk.<\/div>\n<\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">Will masseter Botox cause chewing weakness? Does it affect eating?<\/div>\n<div class=\"faq-a\">Mild chewing strength decrease may occur post-injection \u2014 particularly at 2-4 weeks when the effect is strongest, biting hard objects may feel effortful. But this is temporary and controllable: (1) Rappoel uses moderate dosage (25-40 units per side) \u2014 not completely freezing masseter function, only reducing 20-30% of contraction force. Normal eating is completely unaffected. (2) Chewing is primarily driven by the deep masseter and medial pterygoid \u2014 Rappoel’s injection targets mainly the superficial and middle layers, preserving deep function. (3) If significant chewing weakness occurs (usually from excessive dosage), the dose is reduced at the next session. Precautions: avoid particularly hard foods (nuts, hard candy) for 1 week post-injection, letting the masseter atrophy proceed without extra stimulation. The vast majority of patients eat normally without impact \u2014 only finding very hard items slightly more effortful than before.<\/div>\n<\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">What is the difference between Coretox and Botox for masseter reduction?<\/div>\n<div class=\"faq-a\">Coretox and Botox are both botulinum toxin type A with the same core mechanism, with these main differences: (1) Purity \u2014 Coretox is 150kDa high-purity toxin with complex proteins removed; Botox is 900kDa complex. (2) Onset speed \u2014 Coretox averages 2-3 days; Botox typically 5-7 days. For masseter reduction, Coretox may show muscle slimming at 5-7 days, while Botox takes 10-14 days. (3) Diffusion range \u2014 Coretox has smaller diffusion, safer for masseter injection (reduced risk of spreading to lateral pterygoid affecting mouth opening). (4) Formulation \u2014 Coretox contains no animal-derived proteins or albumin, lower allergy risk. (5) Supply \u2014 Coretox is domestically produced in Korea with stable supply. Both last similarly (4-6 months) with similar slimming effects. Rappoel selects based on patient needs \u2014 Coretox recommended for those wanting fast results or experiencing diminished Botox effect.<\/div>\n<\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">Can masseter Botox be combined with chin filler? Is the V-line effect good?<\/div>\n<div class=\"faq-a\">Highly recommended \u2014 masseter reduction + chin filler is the golden combination for V-line facial contouring: (1) Complementary effects \u2014 Botox reduces masseter to decrease mandibular angle width (narrowing the face), HA filler extends the chin (lengthening and pointing the face), synergistically achieving a narrow + long + pointed V-line. (2) Same-day treatment \u2014 the two target completely different areas (masseter at bilateral mandibular angles vs chin at the mandibular center), non-interfering. (3) Effect timeline \u2014 HA is instant (immediate chin extension visible), Botox takes 2-4 weeks (gradual face narrowing), with combined optimal V-line effect at 1 month. (4) The combination is far superior to either alone \u2014 masseter Botox alone only narrows but doesn’t lengthen (may make the face appear shorter); chin filler alone only lengthens but doesn’t narrow (a square face with chin filler may look even more square); the combination addresses both width and length. Rappoel’s V-line comprehensive plan is based on this principle \u2014 the most cost-effective non-surgical V-line solution.<\/div>\n<\/div>\n<div class=\"cta\">\n<h3>Enlarged masseter making your face square and wide? Rappoel Coretox masseter reduction \u2014 natural facial slimming in 2 weeks!<\/h3>\n<p>\ud83d\udccd 77, Seocho-daero, Seocho-gu, Seoul, South Korea<\/p>\n<p>\ud83d\udd50 Mon\u2013Fri 10:00\u201319:00 \u00b7 Sat 10:00\u201317:00<\/p>\n<p>\ud83d\udcac WeChat Main: rappoelkr | WeChat Backup: rappoelkr2 | LINE: rappoelkr<\/p>\n<p style=\"margin-top:16px;font-size:13px;color:#8B7355;\">Scan to connect with us<\/p>\n<div style=\"display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-top:10px;\">\n<div style=\"text-align:center;\">\n <img decoding=\"async\" src=\"https:\/\/rappoel-clinic.com\/wp-content\/uploads\/2026\/04\/Rappoel\u5fae\u4fe1\u4e8c\u7ef4\u7801\uff08\u4e3b\u53f7\uff09-1.png\" alt=\"WeChat Main QR Code\" style=\"width:120px;height:120px;border-radius:6px;\" \/><\/p>\n<p style=\"font-size:11px;color:#6b5240;margin-top:4px;\">WeChat (Main)<\/p>\n<\/p><\/div>\n<div style=\"text-align:center;\">\n <img decoding=\"async\" src=\"https:\/\/rappoel-clinic.com\/wp-content\/uploads\/2026\/04\/Rappoel\u5fae\u4fe1\u4e8c\u7ef4\u7801\uff08\u5907\u7528\u53f7\uff09-1.png\" alt=\"WeChat Backup QR Code\" style=\"width:120px;height:120px;border-radius:6px;\" \/><\/p>\n<p style=\"font-size:11px;color:#6b5240;margin-top:4px;\">WeChat (Backup)<\/p>\n<\/p><\/div>\n<div style=\"text-align:center;\">\n <img decoding=\"async\" src=\"https:\/\/rappoel-clinic.com\/wp-content\/uploads\/2026\/04\/Line\u4e8c\u7ef4\u7801-1.jpg\" alt=\"LINE QR Code\" style=\"width:120px;height:120px;border-radius:6px;\" \/><\/p>\n<p style=\"font-size:11px;color:#6b5240;margin-top:4px;\">LINE<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n<\/div>\n<p><\/body><br \/>\n<\/html><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Enlarged masseter muscles making your face square and wide? Rappoel Dermatology uses Korea’s Coretox botulinum toxin to precisely inject the masseter \u2014 non-surgical safe jawline slimming with visible results in 2 weeks and optimal effect at 1 month<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[66],"tags":[],"class_list":["post-1630","post","type-post","status-publish","format-standard","hentry","category-botox-en"],"_links":{"self":[{"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/posts\/1630","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/comments?post=1630"}],"version-history":[{"count":1,"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/posts\/1630\/revisions"}],"predecessor-version":[{"id":1632,"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/posts\/1630\/revisions\/1632"}],"wp:attachment":[{"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/media?parent=1630"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/categories?post=1630"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/tags?post=1630"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

{"id":1630,"date":"2026-08-05T10:33:02","date_gmt":"2026-08-05T01:33:02","guid":{"rendered":"https:\/\/rappoel-clinic.com\/coretox-masseter-reduction-en-2\/"},"modified":"2026-08-05T10:33:05","modified_gmt":"2026-08-05T01:33:05","slug":"coretox-masseter-reduction-en-2","status":"publish","type":"post","link":"https:\/\/rappoel-clinic.com\/en\/coretox-masseter-reduction-en-2\/","title":{"rendered":"Coretox Masseter Reduction in Seoul: Non-Surgical Facial Slimming for Narrower Jawline at Rappoel Dermatology Gangnam"},"content":{"rendered":"

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\nCoretox Masseter Reduction in Seoul: Non-Surgical Facial Slimming for Narrower Jawline at Rappoel Dermatology Gangnam<\/title><br \/>\n<meta name=\"description\" content=\"Enlarged masseter muscles making your face square and wide? Rappoel Dermatology uses Korea's Coretox botulinum toxin to precisely inject the masseter \u2014 non-surgical safe jawline slimming with visible results in 2 weeks and optimal effect at 1 month\">\n<link rel=\"alternate\" hreflang=\"en\" href=\"https:\/\/rappoel-clinic.com\/coretox-masseter-reduction-en-2\/\" \/>\n<link rel=\"alternate\" hreflang=\"zh-TW\" href=\"https:\/\/rappoel-clinic.com\/coretox-masseter-reduction-zh-2\/\" \/>\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"MedicalClinic\", \"@id\": \"https:\/\/rappoel-clinic.com\/#clinic\", \"name\": \"Rappoel Dermatology Clinic\", \"alternateName\": [\"Rappoel \u76ae\u819a\u79d1\", \"\ub77c\ud3ec\uc5d8 \ud53c\ubd80\uacfc\"], \"url\": \"https:\/\/rappoel-clinic.com\", \"address\": {\"@type\": \"PostalAddress\", \"streetAddress\": \"77, Seocho-daero\", \"addressLocality\": \"Seocho-gu\", \"addressRegion\": \"Seoul\", \"postalCode\": \"06609\", \"addressCountry\": \"KR\"}, \"geo\": {\"@type\": \"GeoCoordinates\", \"latitude\": 37.4926, \"longitude\": 127.0175}, \"telephone\": \"+82-2-XXXX-XXXX\", \"openingHours\": [\"Mo-Fr 10:00-19:00\", \"Sa 10:00-17:00\"], \"medicalSpecialty\": \"Dermatology\", \"availableService\": [{\"@type\": \"MedicalProcedure\", \"name\": \"Thread Lift (Aptos)\"}, {\"@type\": \"MedicalProcedure\", \"name\": \"Hyaluronic Acid Filler\"}, {\"@type\": \"MedicalProcedure\", \"name\": \"Botulinum Toxin (Botox)\"}, {\"@type\": \"MedicalProcedure\", \"name\": \"Ultherapy \/ HIFU\"}, {\"@type\": \"MedicalProcedure\", \"name\": \"Skin Booster (Juvelook \/ Exosomes)\"}, {\"@type\": \"MedicalProcedure\", \"name\": \"Laser Skin Treatment\"}, {\"@type\": \"MedicalProcedure\", \"name\": \"Onda Coolwaves Body Contouring\"}], \"sameAs\": [\"https:\/\/www.instagram.com\/rappoel_official\"]}<\/script><br \/>\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"Article\", \"headline\": \"Coretox Masseter Reduction in Seoul: Non-Surgical Facial Slimming for Narrower Jawline at Rappoel Dermatology Gangnam\", \"description\": \"Enlarged masseter muscles making your face square and wide? Rappoel Dermatology uses Korea's Coretox botulinum toxin to precisely inject the masseter \u2014 non-surgical safe jawline slimming with visible results in 2 weeks and optimal effect at 1 month\", \"inLanguage\": \"en\", \"author\": {\"@type\": \"Organization\", \"name\": \"Rappoel Dermatology Clinic\"}, \"publisher\": {\"@type\": \"Organization\", \"name\": \"Rappoel Dermatology Clinic\", \"logo\": {\"@type\": \"ImageObject\", \"url\": \"https:\/\/rappoel-clinic.com\/wp-content\/uploads\/2026\/04\/favicon-512.png\"}}, \"about\": {\"@id\": \"https:\/\/rappoel-clinic.com\/#clinic\"}}<\/script><br \/>\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How much smaller will my face get with masseter Botox? Is the effect noticeable?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The slimming effect depends on masseter hypertrophy degree and injection dosage: (1) Mild hypertrophy \u2014 facial width reduces by approximately 3-5mm at 1 month, subtle shift from square toward oval. (2) Moderate hypertrophy \u2014 5-8mm reduction, noticeable decrease in mandibular angle width, significant frontal change. (3) Severe hypertrophy \u2014 8-12mm reduction, dramatic change from obviously square to near-oval. Note: masseter Botox reduces muscle volume, not bone \u2014 if your square face also has wide mandibular bone (skeletal square face), Botox only reduces the muscle component; skeletal reduction requires orthognathic surgery or mandibular angle ostectomy. Rappoel physicians distinguish between muscular and skeletal square faces during assessment \u2014 muscular type responds dramatically to Botox; skeletal type may need combined surgical approach.\"}}, {\"@type\": \"Question\", \"name\": \"How long does masseter Botox last? Will it stop working over time?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Masseter Botox typically lasts 4-6 months \u2014 because the neuromuscular junction gradually regenerates acetylcholine receptors restoring muscle contraction, and muscle volume recovers accordingly. However, an important phenomenon: after each injection, the masseter cannot perform high-intensity chewing during the atrophy period \u2014 equivalent to passive exercise reduction. Many patients find that after 3-5 regular sessions, the masseter's baseline volume is smaller than initially \u2014 even when Botox effect fades, the face doesn't completely return to the original square shape. Regarding resistance: long-term repeated Botox injections may produce neutralizing antibodies causing diminished effect \u2014 incidence approximately 1-5%. Coretox's high-purity formulation theoretically reduces antibody risk. Rappoel recommends: minimum 3-month intervals between injections, lowest effective dose, scientifically managed frequency to minimize resistance risk.\"}}, {\"@type\": \"Question\", \"name\": \"Will masseter Botox cause chewing weakness? Does it affect eating?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Mild chewing strength decrease may occur post-injection \u2014 particularly at 2-4 weeks when the effect is strongest, biting hard objects may feel effortful. But this is temporary and controllable: (1) Rappoel uses moderate dosage (25-40 units per side) \u2014 not completely freezing masseter function, only reducing 20-30% of contraction force. Normal eating is completely unaffected. (2) Chewing is primarily driven by the deep masseter and medial pterygoid \u2014 Rappoel's injection targets mainly the superficial and middle layers, preserving deep function. (3) If significant chewing weakness occurs (usually from excessive dosage), the dose is reduced at the next session. Precautions: avoid particularly hard foods (nuts, hard candy) for 1 week post-injection, letting the masseter atrophy proceed without extra stimulation. The vast majority of patients eat normally without impact \u2014 only finding very hard items slightly more effortful than before.\"}}, {\"@type\": \"Question\", \"name\": \"What is the difference between Coretox and Botox for masseter reduction?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Coretox and Botox are both botulinum toxin type A with the same core mechanism, with these main differences: (1) Purity \u2014 Coretox is 150kDa high-purity toxin with complex proteins removed; Botox is 900kDa complex. (2) Onset speed \u2014 Coretox averages 2-3 days; Botox typically 5-7 days. For masseter reduction, Coretox may show muscle slimming at 5-7 days, while Botox takes 10-14 days. (3) Diffusion range \u2014 Coretox has smaller diffusion, safer for masseter injection (reduced risk of spreading to lateral pterygoid affecting mouth opening). (4) Formulation \u2014 Coretox contains no animal-derived proteins or albumin, lower allergy risk. (5) Supply \u2014 Coretox is domestically produced in Korea with stable supply. Both last similarly (4-6 months) with similar slimming effects. Rappoel selects based on patient needs \u2014 Coretox recommended for those wanting fast results or experiencing diminished Botox effect.\"}}, {\"@type\": \"Question\", \"name\": \"Can masseter Botox be combined with chin filler? Is the V-line effect good?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Highly recommended \u2014 masseter reduction + chin filler is the golden combination for V-line facial contouring: (1) Complementary effects \u2014 Botox reduces masseter to decrease mandibular angle width (narrowing the face), HA filler extends the chin (lengthening and pointing the face), synergistically achieving a narrow + long + pointed V-line. (2) Same-day treatment \u2014 the two target completely different areas (masseter at bilateral mandibular angles vs chin at the mandibular center), non-interfering. (3) Effect timeline \u2014 HA is instant (immediate chin extension visible), Botox takes 2-4 weeks (gradual face narrowing), with combined optimal V-line effect at 1 month. (4) The combination is far superior to either alone \u2014 masseter Botox alone only narrows but doesn't lengthen (may make the face appear shorter); chin filler alone only lengthens but doesn't narrow (a square face with chin filler may look even more square); the combination addresses both width and length. Rappoel's V-line comprehensive plan is based on this principle \u2014 the most cost-effective non-surgical V-line solution.\"}}]}<\/script><\/p>\n<style>\n*{box-sizing:border-box;margin:0;padding:0}\nbody{font-family:'PingFang SC','Noto Sans KR',sans-serif;background:#fffcf7;color:#3d2e1e;line-height:1.8}\n.wrap{max-width:677px;margin:0 auto;padding:32px 20px 60px}\n.banner{background:#FFF8EC;text-align:center;padding:36px 20px 28px;margin-bottom:36px;border-bottom:1px solid #e8d5c0}\n.banner-tag{font-size:11px;letter-spacing:3px;color:#8B7355;text-transform:uppercase;margin-bottom:12px}\n.banner h1{font-size:24px;color:#3d2e1e;line-height:1.4;margin-bottom:12px}\n.banner .sub{font-size:13px;color:#6b5240;line-height:1.7}\nh2{font-size:19px;color:#3d2e1e;margin:32px 0 14px;padding-bottom:8px;border-bottom:1px solid #e8d5c0}\nh3{font-size:16px;color:#3d2e1e;margin:22px 0 10px}\np{font-size:15px;color:#555;line-height:1.9;margin-bottom:14px}\n.highlight{background:#fff;border:1px solid #f0e8dc;border-left:3px solid #D4A574;padding:16px 20px;margin:22px 0;border-radius:0 6px 6px 0}\n.highlight p{margin:0;font-size:14px;color:#6b5240}\n.card{background:#F5E6C8;border:1px solid #e8d5c0;border-radius:8px;padding:18px 22px;margin:16px 0}\n.card-title{font-size:13px;font-weight:700;color:#3d2e1e;margin-bottom:6px}\n.card p{font-size:14px;margin:0}\n.faq-item{margin:14px 0;border-bottom:1px solid #f0e8dc;padding-bottom:14px}\n.faq-q{font-weight:700;color:#3d2e1e;font-size:15px;margin-bottom:6px}\n.faq-a{font-size:14px;color:#555;line-height:1.8}\n.cta{background:#F5E6C8;text-align:center;padding:32px 20px;margin-top:40px;border-radius:8px}\n.cta h3{font-size:17px;color:#3d2e1e;margin-bottom:8px}\n.cta p{font-size:13px;color:#6b5240;margin-bottom:4px}\nimg{max-width:100%;height:auto;display:block;margin:20px auto;border-radius:6px}\nul,ol{padding-left:22px;margin-bottom:14px}\nli{font-size:15px;color:#555;line-height:1.9;margin-bottom:4px}\n.schema-block{display:none}\n@media(max-width:600px){.wrap{padding:20px 14px 40px}.banner h1{font-size:20px}}\n<\/style>\n<p><\/head><br \/>\n<body><\/p>\n<div class=\"wrap\">\n<div class=\"banner\">\n<div class=\"banner-tag\">Botox<\/div>\n<h1>Coretox Masseter Reduction in Seoul: Non-Surgical Facial Slimming for Narrower Jawline at Rappoel Dermatology Gangnam<\/h1>\n<div class=\"sub\">Enlarged masseter muscles making your face square and wide? Rappoel Dermatology uses Korea’s Coretox botulinum toxin to precisely inject the masseter \u2014 non-surgical safe jawline slimming with visible results in 2 weeks and optimal effect at 1 month<\/div>\n<\/p><\/div>\n<p>The masseter muscle is the primary muscle among the masticatory muscle group located in the mandibular angle area on both sides of the face \u2014 it originates from the lower border and medial surface of the zygomatic arch and inserts on the mandibular angle and lateral ramus. The masseter functions in jaw closure and chewing \u2014 when we clench our teeth, the bulging muscle masses at the mandibular angles are clearly palpable. Masseter hypertrophy is a common facial concern among East Asian populations, particularly East Asian women \u2014 enlarged masseters make the mandibular angle area noticeably wide, creating a square or trapezoidal face shape rather than the ideal oval or V-line. Causes of masseter hypertrophy include: (1) Genetics \u2014 some people naturally have larger masseter volume and thicker muscle fibers. (2) Chewing habits \u2014 long-term preference for hard foods (nuts, jerky, dried squid), frequent gum or betel nut chewing overdevelops the masseter. (3) Bruxism \u2014 unconscious teeth clenching during sleep causes sustained high-intensity masseter contraction, leading to compensatory hypertrophy over time. (4) Stress-related clenching \u2014 unconscious jaw clenching during mental tension. (5) Unilateral chewing \u2014 long-term preferential chewing on one side makes that masseter more developed, causing facial asymmetry. Rappoel Dermatology near Gangnam Station, Seoul, uses Korea’s Coretox botulinum toxin \u2014 precisely injecting the masseter for selective muscle atrophy and reduction, providing a safe, effective, non-surgical facial slimming solution.<\/p>\n<h2>Technical Principles of Coretox Masseter Reduction<\/h2>\n<ul>\n<li><strong>Botulinum toxin selective muscle atrophy mechanism:<\/strong> Coretox is botulinum toxin type A \u2014 when injected into the masseter, it blocks acetylcholine release at the neuromuscular junction, causing masseter muscle fibers to lose neural stimulation and enter a state of disuse atrophy. Muscle fibers gradually thin and volume decreases \u2014 clinical data shows masseter volume reduces by an average of 20-30% at 4-6 weeks post-injection, reaching maximum atrophy of approximately 30-40% at 3 months<\/li>\n<li><strong>Coretox Korean-origin purity advantage:<\/strong> Coretox is a 150kDa high-purity toxin developed by Daewoong Pharmaceutical \u2014 unnecessary complex proteins removed, theoretically reducing antibody formation and resistance risk. For patients requiring long-term repeated injections (masseter reduction typically needs 2-3 sessions per year for maintenance), the high-purity formulation is more beneficial for maintaining consistent long-term results<\/li>\n<li><strong>Faster onset (3-5 days):<\/strong> Coretox clinical data shows average onset of 2-3 days \u2014 masseter area effects begin appearing at 7-10 days (muscle starts relaxing), preliminary slimming visible at 2 weeks, optimal results at 4-6 weeks<\/li>\n<li><strong>Precise diffusion control:<\/strong> The most critical safety consideration in masseter injection is preventing toxin spread to surrounding muscles \u2014 particularly the deep lateral pterygoid (spread may affect mouth opening) and superficial risorius (spread may affect smiling). Coretox’s smaller diffusion range makes it safer for masseter injection<\/li>\n<li><strong>Preservative-free hypoallergenic formulation:<\/strong> Coretox contains no animal-derived proteins or human serum albumin \u2014 reducing allergic reaction risk, suitable for sensitive patients requiring long-term repeated injections<\/li>\n<\/ul>\n<h2>Detailed Anatomy and Safety for Masseter Injection<\/h2>\n<ul>\n<li><strong>Masseter three-layer anatomy:<\/strong> The masseter has superficial, middle, and deep layers \u2014 the superficial layer is largest and thickest (the primary injection target), while middle and deep layers are smaller. Injection targets mainly the superficial and middle layers \u2014 deep injection is high-risk (near the lateral pterygoid and facial nerve branches)<\/li>\n<li><strong>Safe injection zone marking:<\/strong> Rappoel physicians have patients clench to mark the masseter bulge \u2014 injection points are strictly within: upper boundary below the tragus-to-mouth-corner line, lower boundary 1.5cm above the mandibular inferior border, anterior boundary at the masseter anterior edge, posterior boundary pre-auricular. 3-5 injection points per side distributed evenly<\/li>\n<li><strong>Avoiding parotid duct and facial nerve:<\/strong> The parotid duct crosses the masseter surface (approximately 1cm below the zygomatic arch, parallel to it) with facial nerve buccal branches \u2014 injection needles angle downward into the muscle, avoiding the superficial parotid duct and nerve<\/li>\n<li><strong>Precise dose distribution:<\/strong> Total Coretox per side: 25-40 units (adjusted for masseter volume) \u2014 divided across 3-5 points, 5-15 units each. Too low yields insufficient effect; too high may cause chewing weakness<\/li>\n<li><strong>Avoiding asymmetry:<\/strong> Most people have asymmetric masseter size (related to unilateral chewing habits) \u2014 physicians measure bilateral masseter thickness before injection, adjusting dosage distribution based on asymmetry<\/li>\n<\/ul>\n<h2>Rappoel Masseter Botox Injection Treatment Protocol<\/h2>\n<ol>\n<li><strong>Facial assessment and plan design (10 min):<\/strong> Frontal and side evaluation of mandibular angle width \u2192 patient clenches to assess masseter bulge and thickness \u2192 evaluate facial symmetry \u2192 confirm no special conditions like bruxism \u2192 establish injection plan (points, dosage, bilateral distribution)<\/li>\n<li><strong>Disinfection preparation (5 min):<\/strong> Facial cleansing \u2192 povidone-iodine bilateral mandibular angle preparation \u2192 mark injection points<\/li>\n<li><strong>Precise injection (8-10 min):<\/strong> 30G ultra-fine needle \u2192 3-5 injection points per side \u2192 injection depth within the masseter muscle belly (approximately 1-1.5cm deep) \u2192 5-15 units Coretox per point \u2192 immediate gentle pressure for hemostasis<\/li>\n<li><strong>Immediate assessment and guidance (5 min):<\/strong> Patient performs clenching and mouth opening to confirm normal function \u2192 post-care instructions (avoid pressing injection area, avoid lying flat for 4 hours, etc.) \u2192 2-week follow-up scheduled for effect evaluation<\/li>\n<\/ol>\n<p>The entire masseter Coretox injection takes about 20-25 minutes, with onset at 7-10 days, preliminary slimming at 2 weeks, optimal results at 4-6 weeks, lasting 4-6 months. Located 3 minutes from Gangnam Station Exit 10, with seamless English and Chinese consultation.<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<div class=\"faq-item\">\n<div class=\"faq-q\">How much smaller will my face get with masseter Botox? Is the effect noticeable?<\/div>\n<div class=\"faq-a\">The slimming effect depends on masseter hypertrophy degree and injection dosage: (1) Mild hypertrophy \u2014 facial width reduces by approximately 3-5mm at 1 month, subtle shift from square toward oval. (2) Moderate hypertrophy \u2014 5-8mm reduction, noticeable decrease in mandibular angle width, significant frontal change. (3) Severe hypertrophy \u2014 8-12mm reduction, dramatic change from obviously square to near-oval. Note: masseter Botox reduces muscle volume, not bone \u2014 if your square face also has wide mandibular bone (skeletal square face), Botox only reduces the muscle component; skeletal reduction requires orthognathic surgery or mandibular angle ostectomy. Rappoel physicians distinguish between muscular and skeletal square faces during assessment \u2014 muscular type responds dramatically to Botox; skeletal type may need combined surgical approach.<\/div>\n<\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">How long does masseter Botox last? Will it stop working over time?<\/div>\n<div class=\"faq-a\">Masseter Botox typically lasts 4-6 months \u2014 because the neuromuscular junction gradually regenerates acetylcholine receptors restoring muscle contraction, and muscle volume recovers accordingly. However, an important phenomenon: after each injection, the masseter cannot perform high-intensity chewing during the atrophy period \u2014 equivalent to passive exercise reduction. Many patients find that after 3-5 regular sessions, the masseter’s baseline volume is smaller than initially \u2014 even when Botox effect fades, the face doesn’t completely return to the original square shape. Regarding resistance: long-term repeated Botox injections may produce neutralizing antibodies causing diminished effect \u2014 incidence approximately 1-5%. Coretox’s high-purity formulation theoretically reduces antibody risk. Rappoel recommends: minimum 3-month intervals between injections, lowest effective dose, scientifically managed frequency to minimize resistance risk.<\/div>\n<\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">Will masseter Botox cause chewing weakness? Does it affect eating?<\/div>\n<div class=\"faq-a\">Mild chewing strength decrease may occur post-injection \u2014 particularly at 2-4 weeks when the effect is strongest, biting hard objects may feel effortful. But this is temporary and controllable: (1) Rappoel uses moderate dosage (25-40 units per side) \u2014 not completely freezing masseter function, only reducing 20-30% of contraction force. Normal eating is completely unaffected. (2) Chewing is primarily driven by the deep masseter and medial pterygoid \u2014 Rappoel’s injection targets mainly the superficial and middle layers, preserving deep function. (3) If significant chewing weakness occurs (usually from excessive dosage), the dose is reduced at the next session. Precautions: avoid particularly hard foods (nuts, hard candy) for 1 week post-injection, letting the masseter atrophy proceed without extra stimulation. The vast majority of patients eat normally without impact \u2014 only finding very hard items slightly more effortful than before.<\/div>\n<\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">What is the difference between Coretox and Botox for masseter reduction?<\/div>\n<div class=\"faq-a\">Coretox and Botox are both botulinum toxin type A with the same core mechanism, with these main differences: (1) Purity \u2014 Coretox is 150kDa high-purity toxin with complex proteins removed; Botox is 900kDa complex. (2) Onset speed \u2014 Coretox averages 2-3 days; Botox typically 5-7 days. For masseter reduction, Coretox may show muscle slimming at 5-7 days, while Botox takes 10-14 days. (3) Diffusion range \u2014 Coretox has smaller diffusion, safer for masseter injection (reduced risk of spreading to lateral pterygoid affecting mouth opening). (4) Formulation \u2014 Coretox contains no animal-derived proteins or albumin, lower allergy risk. (5) Supply \u2014 Coretox is domestically produced in Korea with stable supply. Both last similarly (4-6 months) with similar slimming effects. Rappoel selects based on patient needs \u2014 Coretox recommended for those wanting fast results or experiencing diminished Botox effect.<\/div>\n<\/div>\n<div class=\"faq-item\">\n<div class=\"faq-q\">Can masseter Botox be combined with chin filler? Is the V-line effect good?<\/div>\n<div class=\"faq-a\">Highly recommended \u2014 masseter reduction + chin filler is the golden combination for V-line facial contouring: (1) Complementary effects \u2014 Botox reduces masseter to decrease mandibular angle width (narrowing the face), HA filler extends the chin (lengthening and pointing the face), synergistically achieving a narrow + long + pointed V-line. (2) Same-day treatment \u2014 the two target completely different areas (masseter at bilateral mandibular angles vs chin at the mandibular center), non-interfering. (3) Effect timeline \u2014 HA is instant (immediate chin extension visible), Botox takes 2-4 weeks (gradual face narrowing), with combined optimal V-line effect at 1 month. (4) The combination is far superior to either alone \u2014 masseter Botox alone only narrows but doesn’t lengthen (may make the face appear shorter); chin filler alone only lengthens but doesn’t narrow (a square face with chin filler may look even more square); the combination addresses both width and length. Rappoel’s V-line comprehensive plan is based on this principle \u2014 the most cost-effective non-surgical V-line solution.<\/div>\n<\/div>\n<div class=\"cta\">\n<h3>Enlarged masseter making your face square and wide? Rappoel Coretox masseter reduction \u2014 natural facial slimming in 2 weeks!<\/h3>\n<p>\ud83d\udccd 77, Seocho-daero, Seocho-gu, Seoul, South Korea<\/p>\n<p>\ud83d\udd50 Mon\u2013Fri 10:00\u201319:00 \u00b7 Sat 10:00\u201317:00<\/p>\n<p>\ud83d\udcac WeChat Main: rappoelkr | WeChat Backup: rappoelkr2 | LINE: rappoelkr<\/p>\n<p style=\"margin-top:16px;font-size:13px;color:#8B7355;\">Scan to connect with us<\/p>\n<div style=\"display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-top:10px;\">\n<div style=\"text-align:center;\">\n <img decoding=\"async\" src=\"https:\/\/rappoel-clinic.com\/wp-content\/uploads\/2026\/04\/Rappoel\u5fae\u4fe1\u4e8c\u7ef4\u7801\uff08\u4e3b\u53f7\uff09-1.png\" alt=\"WeChat Main QR Code\" style=\"width:120px;height:120px;border-radius:6px;\" \/><\/p>\n<p style=\"font-size:11px;color:#6b5240;margin-top:4px;\">WeChat (Main)<\/p>\n<\/p><\/div>\n<div style=\"text-align:center;\">\n <img decoding=\"async\" src=\"https:\/\/rappoel-clinic.com\/wp-content\/uploads\/2026\/04\/Rappoel\u5fae\u4fe1\u4e8c\u7ef4\u7801\uff08\u5907\u7528\u53f7\uff09-1.png\" alt=\"WeChat Backup QR Code\" style=\"width:120px;height:120px;border-radius:6px;\" \/><\/p>\n<p style=\"font-size:11px;color:#6b5240;margin-top:4px;\">WeChat (Backup)<\/p>\n<\/p><\/div>\n<div style=\"text-align:center;\">\n <img decoding=\"async\" src=\"https:\/\/rappoel-clinic.com\/wp-content\/uploads\/2026\/04\/Line\u4e8c\u7ef4\u7801-1.jpg\" alt=\"LINE QR Code\" style=\"width:120px;height:120px;border-radius:6px;\" \/><\/p>\n<p style=\"font-size:11px;color:#6b5240;margin-top:4px;\">LINE<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n<\/div>\n<p><\/body><br \/>\n<\/html><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Enlarged masseter muscles making your face square and wide? Rappoel Dermatology uses Korea’s Coretox botulinum toxin to precisely inject the masseter \u2014 non-surgical safe jawline slimming with visible results in 2 weeks and optimal effect at 1 month<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[66],"tags":[],"class_list":["post-1630","post","type-post","status-publish","format-standard","hentry","category-botox-en"],"_links":{"self":[{"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/posts\/1630","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/comments?post=1630"}],"version-history":[{"count":1,"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/posts\/1630\/revisions"}],"predecessor-version":[{"id":1632,"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/posts\/1630\/revisions\/1632"}],"wp:attachment":[{"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/media?parent=1630"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/categories?post=1630"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rappoel-clinic.com\/en\/wp-json\/wp\/v2\/tags?post=1630"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}