Masseter botox for square jaw reduction is one of Korea's most-requested foreign-patient treatments. Korean technique emphasizes precise dosing for natural V-line contouring without overcorrection. Here's the honest guide for international patients.
Subtle V-line, not dramatic transformation. Korean technique = natural.
Masseter botox shrinks the masseter muscle (the chewing muscle) to slim the lower face from square to V-shaped. Korean technique is more conservative than US/EU technique — Korean injectors typically use 30–50 units per side(Botox/Xeomin) for natural contouring vs Western 50–80 units producing more dramatic but sometimes overcorrected results. Effect emerges over 2–4 weeks as the muscle gradually atrophies; peak at 8 weeks; holds 4–6 months. Realistic expectation: subtle V-line softening, not dramatic transformation. JRYN pricing $180–$280 vs $500–$900 at US clinics. For more aggressive contouring, repeat treatment every 4–6 months across 2–3 cycles produces compounding effect — bigger results with less single-session dosing. Same-day flight OK; mild swelling 12–24h.
Dr. Lee evaluates masseter muscle thickness via palpation while you clench. Assesses bone structure underneath — botox can't change bone. Photographs front, three-quarter, and side angles for baseline. Confirms candidacy.
Korean technique uses 3–5 injection points per side, mapped to muscle thickness pattern. More superficial points than Western technique reduces risk of unintended adjacent muscle effect (smile asymmetry).
First session typically 30–40 units per side (Botox or Xeomin). For repeat patients, 25–35 units suffices once muscle is partially atrophied from prior cycles. Lower dose = lower risk of asymmetry or overcorrection.
Procedure itself 5 minutes. 30G needle, minimal discomfort. No numbing required for most patients. Mild stinging at each injection point. Done before you've finished checking your phone.
Days 1–7: nothing visible (muscle still functioning normally). Weeks 2–4: gradual softening as muscle atrophies. Week 8: peak V-line effect. Months 4–6: gradual return as botox metabolizes. Repeat at 4–5 month mark for sustained effect.
Each cycle further atrophies the masseter; muscle volume reduces incrementally. By cycle 3 (12+ months in), some patients have permanent baseline reduction even between cycles. JRYN designs 6-month maintenance schedule.
Most dramatic results. Hypertrophic masseter responds strongly to first session. Visible V-line by week 4. Good candidate for compounding cycles.
Dual benefit: V-line + bruxism relief. Many JRYN patients book primarily for tension headache relief; V-line is bonus. Higher dose typical.
Subtle improvement. Single session may be enough or insufficient depending on baseline. Honest expectation: 'noticeable to you, possibly subtle to others.'
Botox can't change bone. If your square jaw is from mandibular angle (bone structure), surgery is the only option. Botox helps if soft tissue contributes.
Increasingly popular among Korean and foreign male patients. Same technique, often slightly higher dose due to thicker muscle. Subtle masculine V-line.
Generally not recommended unless severe masseter hypertrophy or bruxism. Aesthetic treatment in young patients should be conservative — natural face development still ongoing.
Original onabotulinumtoxinA. Strongest clinical data globally. KFDA + FDA approved. ~$240/side at JRYN. Slight premium over Korean alternatives.
incobotulinumtoxinA. Pure formulation without complex proteins. Comparable efficacy to Botox. Some patients prefer due to lower antibody risk in long-term repeat use. ~$220/side.
Korean-developed botulinum brands. KFDA approved, comparable mechanism. Lower cost (~$180/side). Strong domestic adoption; suitable for cost-conscious patients.
DaxibotulinumtoxinA. Marketed as longer-lasting (5–6 months hold). Limited Korean availability; not currently used at JRYN. Available at some Seoul clinics if specifically requested.
Mild redness or pinpoint bruising at injection sites. Tylenol if any tenderness (no aspirin/ibuprofen for 24h to reduce bruise risk). Avoid touching or massaging treated area. Mild swelling possible.
No lying down for 4 hours post-injection. No vigorous exercise for 24 hours. Avoid alcohol for 24 hours. No facials, sauna, hot baths for 48 hours. These reduce risk of botox migration to unintended muscles.
You'll notice difficulty chewing tough foods (steak, gum) — normal as muscle atrophies. Switch to softer foods if uncomfortable. Photos at week 4 vs baseline help track progress. Most patients see meaningful change by week 4.
Effect fades gradually. Schedule repeat session at month 4–5 to maintain V-line without lapse. Some patients prefer to let effect fully wear off then restart; others maintain continuous effect. Both approaches work.
Dr. Lee Portrait
A medical decision should not feel rushed.
My job is to give you the 30 minutes you couldn't get at home
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then deliver treatment that respects what made you fly here in the first place.
WhatsApp us photos. Within 24 hours we recommend brand, dose, and total pricing in USD/JPY/TWD. Same-day or next-day appointments available. Conservative Korean technique — subtle results, not dramatic overcorrection.
Individual results may vary. Content is for informational purposes only and is not a substitute for medical advice. Please consult a licensed medical professional before any procedure. Prices are estimates and may change. JRYN Dermatology is licensed under the Korean Medical Service Act.
