A square or overly broad jawline, commonly called a ‘square face’, is a concern for many Asian individuals, especially noticeable in photographs. The cause is often not skeletal but rather hypertrophied masseter muscles — the chewing muscles that overdevelop from habits like chewing hard foods, teeth grinding (bruxism), or stress-related clenching. Coretox, developed by Korea’s Hugel Pharmaceuticals, is a fourth-generation botulinum toxin with high purity and stable molecular structure, particularly suited for large muscle group injections like the masseter. Rappoel Clinic in Seoul offers precise Coretox masseter reduction treatments — achieving a refined V-line without bone-shaving surgery.
How Coretox Masseter Injection Works
- Mechanism: Coretox injected into the masseter blocks nerve signal transmission, causing the muscle to gradually relax and atrophy from within, reducing muscle volume
- Results Timeline: Effects begin appearing 2-4 weeks after injection, with cheeks gradually narrowing; peak results at 3 months, with a visibly slimmer V-line
- Duration: Typically 4-6 months; a follow-up session at 3-4 months is recommended for first-time patients to prolong and optimize results
- Added Benefit: Relaxed masseter muscles also significantly reduce nighttime teeth grinding, alleviating grinding-related headaches, jaw soreness, and dental wear
Rappoel’s Coretox Masseter Injection Procedure
- Pre-Treatment Assessment: The doctor palpates masseter thickness, evaluates asymmetry, inquires about chewing habits and bruxism, and designs a personalized dosing plan
- Marking and Injection: Precise marking of injection points avoiding blood vessels and the parotid gland; rapid injection with a fine needle; total procedure time approximately 10-15 minutes
- Post-Treatment Care: Avoid pressing the injection area, sleeping face-down, or facial massage for 4 hours; normal diet is fine but avoid excessively hard foods for 48 hours
Ideal Candidates
- Noticeably enlarged masseter muscles; square or overly wide face shape
- Visible muscle bulging at both cheeks when clenching teeth
- Nighttime teeth grinding habits; morning jaw soreness
- Facial asymmetry — stronger dose can target the larger side to gradually correct imbalance
- Seeking non-surgical facial contouring, avoiding the recovery time and risks of bone-shaving surgery
Rappoel Clinic, located in Seoul’s Gangnam district, has board-certified dermatologists with deep expertise in Asian facial muscle anatomy. Each Coretox dosage and injection placement is customized to the patient’s masseter distribution and facial contour goals, ensuring natural-looking slimming and proper handling of any asymmetry.
Frequently Asked Questions
Ready to say goodbye to a square jaw and achieve a refined V-line? Contact Rappoel Clinic Seoul
📍 77, Seocho-daero, Seocho-gu, Seoul, South Korea
🕐 Mon–Fri 10:00–19:00 · Sat 10:00–17:00
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