Gangnam
Dr. Yoongon Ryu
Aesthetic Medicine Specialist
Flagship clinic · KOL for leading lifting & regenerative devices
Botulinum toxin type A relaxes the masseter muscle to slim a square jaw and ease clenching, with results that typically last 4 to 6 months.
Masseter botox in Seoul uses injections of botulinum toxin type A into the masseter, the large chewing muscle at the jaw angle, to soften a square jaw and reduce clenching. The treatment takes about 10 to 15 minutes, visible slimming develops over 4 to 8 weeks, and effects usually last 4 to 6 months at our three Seoul-area locations.
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Masseter botox is the use of botulinum toxin type A, a purified neuromodulator, to relax the masseter muscle at the angle of the jaw. The masseter is one of the main chewing muscles, and when it is enlarged from genetics, hard chewing, or habitual clenching, it can give the lower face a square or wide appearance. Relaxing it gradually reduces its bulk, softening the jawline.
At Reberry Clinic, treatment is consultation-led. The clinic’s doctors palpate the masseter while you clench, map the muscle bulk on each side, and plan dose and injection depth before any treatment. Because masseter size often differs slightly left to right, careful, symmetry-aware dosing matters for a balanced result.
Masseter botox is popular with international patients seeking a slimmer lower face or relief from teeth grinding (bruxism) and jaw tension. English support is available across our three Seoul-area locations (Gangnam, Myeongdong, Incheon Airport).
Botulinum toxin type A is a neuromodulator that temporarily blocks the release of acetylcholine at the neuromuscular junction, the chemical signal that tells a muscle to contract. When measured doses are injected into the masseter, the muscle contracts less during chewing and clenching. Over the following weeks, reduced use leads to a gradual decrease in muscle volume, so the jaw angle slims and clenching force drops. The effect is reversible: as nerve terminals regenerate over several months, muscle activity returns and bulk slowly rebuilds, which is why maintenance sessions are needed to sustain the slimming.
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The doctor has you clench to map masseter bulk on each side and plan roughly 2 to 3 injection points per side.
Measured doses of botulinum toxin type A are injected into the masseter over about 10 to 15 minutes.
The toxin blocks acetylcholine release, so the masseter contracts less within 3 to 7 days.
With reduced use, masseter volume decreases gradually over 4 to 8 weeks, slimming the jaw angle.
Activity returns over 4 to 6 months as nerve signalling recovers, so maintenance sessions sustain results.
See representative outcomes from Reberry Clinic. Results build gradually and vary by individual; your plan is assessed at consultation.
The clinic’s doctors assess masseter bulk on each side, check for clenching, and plan dose and placement in English.
The injections take about 10 to 15 minutes; ice or topical numbing keeps the visit comfortable.
You can usually return to normal activities right away, avoiding hard chewing immediately afterward if advised.
Clenching eases within 1 to 2 weeks, while visible slimming develops over 4 to 8 weeks.
Slimming lasts about 4 to 6 months; repeat sessions maintain the contour and reduce clenching.
Masseter botox is the injection of botulinum toxin type A into the masseter, the chewing muscle at the jaw angle, to slim a square lower face and ease clenching. With less use, the muscle gradually shrinks. Slimming develops over 4 to 8 weeks and typically lasts 4 to 6 months before a repeat session.
Masseter botox usually lasts about 4 to 6 months, after which muscle activity returns and bulk slowly rebuilds. With repeated maintenance, some patients find the muscle stays slimmer for longer. Dosing is individualised on our botox injection page, and most schedule two to three sessions a year.
Clenching strength eases within 3 to 7 days, but visible slimming takes longer, developing over 4 to 8 weeks as the masseter reduces in volume. Peak narrowing usually appears around 8 to 12 weeks. Because the change is gradual, the result looks natural rather than sudden, which most patients prefer.
Discomfort is minimal, described as brief pinprick sensations during the small injections at the jaw angle. The needles are very fine, and ice or topical numbing can be used for sensitive patients. The whole process takes about 10 to 15 minutes, and any stinging fades almost immediately after each injection point.
Downtime is minimal, and most patients return to daily activities right away. You may notice tiny red marks or, rarely, a small bruise that settles within a few days. Avoid vigorously massaging the area and heavy chewing of very tough foods for the first day so the product settles where intended.
Yes, relaxing the masseter reduces clenching force, which often eases bruxism and related jaw tension or morning soreness. Many patients seek it for this functional benefit as much as for slimming. Your doctor reviews your bite and may suggest a dental check if a TMJ or grinding problem is significant, planning dose accordingly.
Adults with a square jaw from masseter bulk, or those who clench and grind, are ideal candidates. If lower-face fullness comes from fat or bone rather than muscle, slimming will be limited. A consultation confirms whether muscle is the cause. Explore related options on our botox injection page.
Masseter dosing is individualised, generally a moderate number of units per side spread across 2 to 3 points, adjusted for muscle bulk and any left-right asymmetry. Your doctor sets the exact dose after palpating the muscle. You can read more about treatment planning on our botox injection page.
You may notice slightly reduced chewing power for the first one to two weeks, especially with very tough foods, but normal eating is unaffected for most patients. This settles as you adapt. The masseter is only partly relaxed by design, so jaw function for everyday meals stays comfortable throughout the treatment period.
Yes, it pairs well with jawline contouring, energy-based skin tightening for laxity, and chin or jawline filler for shape. Your doctor sequences these safely in one plan. To understand volume-based contouring options, see our injectable fillers page and how fillers differ from muscle relaxation.
Common effects are brief redness, tiny bruises, or mild tenderness at the jaw that resolve within days. Less commonly, a temporary asymmetric smile or chewing fatigue can occur, settling as the dose balances. Serious reactions are rare with proper technique. Share your full medical and dental history to reduce any risk beforehand.
Botulinum toxin type A has a long, well-documented safety record for masseter contouring when administered by trained doctors at appropriate doses. Effects are temporary as the body restores nerve signalling over months. Choosing an experienced clinic and accurate, symmetry-aware dosing matters far more than chasing the most dramatic slimming possible.
Aftercare is simple: stay upright for about 4 hours, avoid rubbing or massaging the jaw, and skip strenuous exercise, saunas, and alcohol that day. Eating soft foods for a day can be comfortable. Pairing with a gentle skin care routine supports the skin while your doctor’s written guidance covers the rest.
Masseter botox needs very little time, so even a 1 to 2 day visit works for consultation and treatment. Because there is minimal downtime, you can sightsee the same day, though jaw slimming itself develops over the following weeks at home. Our English-speaking team helps schedule the appointment into a short trip.
Yes, you can fly the same day, since the treatment is quick and non-invasive. Try to stay upright during the first few hours rather than reclining immediately, and avoid rubbing the jaw. Cabin pressure does not affect the result, so air travel after masseter botox is generally not a concern for visitors.
International patients can have remote check-ins in English about four weeks after treatment, once slimming is developing, to review the result and plan repeat sessions around future trips. You can also arrange complementary care such as skin care when you return. Your dosing notes are kept on file for consistency.
| Botulinum Toxin Type A | Energy-Based Skin Tightening | Buccal Fat Reduction | |
|---|---|---|---|
| Mechanism | Relaxes and shrinks the masseter muscle | Heats dermis to firm and lift skin | Surgically removes a cheek fat pad |
| Best for | Square jaw from muscle bulk and clenching | Skin laxity along the jawline | Full mid-cheek fullness, not muscle |
| Pain / comfort | Brief pinprick sensations | Warmth during treatment | Surgical, requires anaesthetic |
| Downtime | Minimal, occasional tiny bruise | Minimal | Swelling for one to two weeks |
| Results timeline | Slimming over 4 to 8 weeks | Builds over weeks to months | Settles over weeks |
| Longevity | About 4 to 6 months | Around a year, varies | Long-lasting structural change |
| Sessions | Repeated every 4 to 6 months | Usually 1, with maintenance | Single surgical procedure |
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