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 jawline and ease clenching, with a gradual change visible over about 4 to 6 weeks.
Jaw botox in Seoul injects botulinum toxin type A into the masseter, the chewing muscle at the back of the jaw, to gradually slim a square jawline and reduce clenching. Treatment takes about 10 to 15 minutes, the slimming builds over 4 to 6 weeks, and results last 4 to 6 months across our three Seoul-area locations.
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Jaw botox, also called masseter botox, is the use of botulinum toxin type A, a purified neuromodulator, injected into the masseter, the large chewing muscle at the back of the jaw. When this muscle is enlarged from genetics, heavy chewing, or habitual clenching, it widens the lower face. Relaxing it allows the muscle to gradually reduce in bulk, softening a square jawline into a slimmer, more tapered shape over several weeks.
Unlike line-softening treatments, jaw botox works by reducing muscle volume rather than wrinkles, so the change is gradual rather than immediate. At Reberry Clinic, treatment is consultation-led. The clinic’s doctors palpate the masseter while you clench, check for asymmetry, and plan placement across about 3 injection points per side, set deep into the muscle and away from the muscles that shape your smile.
Jaw botox also eases bruxism (teeth grinding) and clenching-related jaw tension and headaches for many patients, so it serves both a contouring and a functional purpose. International patients are supported in English 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 injected deep into the masseter, it reduces the muscle’s contraction during chewing and clenching. With less activity over roughly 4 to 6 weeks, the muscle gradually shrinks in bulk (a process called disuse atrophy), slimming the jawline. The effect is reversible: as nerve signalling and chewing strength recover over about 4 to 6 months, the muscle regains volume, which is why maintenance sessions are needed to sustain the slimmer contour.
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The doctor palpates the masseter while you clench and checks symmetry, planning placement across about 3 points per side.
Botulinum toxin type A is injected deep into the masseter on each side over about 10 to 15 minutes.
The toxin blocks acetylcholine, lowering muscle activity within roughly 1 to 2 weeks.
With less use, the masseter slowly reduces in bulk, with visible jawline slimming over 4 to 6 weeks.
Chewing strength and muscle volume return over 4 to 6 months, so maintenance sessions sustain the contour.
See representative outcomes from Reberry Clinic. Results build gradually and vary by individual; your plan is assessed at consultation.
The clinic’s doctors assess your masseter size, symmetry, and goals, planning dose and placement across about 3 points per side in English.
The injections take about 10 to 15 minutes; optional numbing or ice keeps the visit comfortable.
You can usually return to normal activities right away; mild chewing fatigue with hard foods may occur in the first weeks.
Clenching eases within 1 to 2 weeks, with visible jaw slimming building over 4 to 6 weeks.
Results last about 4 to 6 months; repeat sessions maintain the slimmer contour, and effects often deepen over a few sessions.
Jaw botox, or masseter botox, is the injection of botulinum toxin type A into the masseter chewing muscle to gradually slim a square jawline and reduce clenching. By lowering muscle activity, the masseter slowly reduces in bulk over weeks. Visible slimming builds over 4 to 6 weeks and results typically last 4 to 6 months.
Jaw botox usually lasts about 4 to 6 months, longer than line treatments, after which chewing strength and muscle volume gradually return. With repeat sessions the masseter often stays slimmer for longer; dosing is individualised on our botox injection page. Many patients maintain results two to three times a year.
Jaw botox works gradually, unlike line treatments. You may feel reduced clenching within 1 to 2 weeks, but visible jawline slimming develops over 4 to 6 weeks as the muscle reduces in bulk. The fullest effect is often seen around 8 to 12 weeks, and results can deepen across several maintenance sessions.
Discomfort is minimal, described as brief pinprick sensations during the roughly 3 deeper injections per side into the masseter. 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.
Downtime is minimal, and most patients return to daily activities right away. You may notice mild chewing fatigue with hard or chewy foods during the first couple of weeks, which settles as you adjust. Avoid massaging the area for a few hours. A rare small bruise can occur but resolves within days.
Yes, masseter botox is widely used to ease bruxism (teeth grinding) and jaw clenching by reducing the force of the chewing muscle. Many patients report less jaw tension, fewer clench-related headaches, and protection for their teeth. Your doctor can plan a dose aimed at both function and contour, as outlined on our botox injection page.
Eating normally remains possible; you may feel mild fatigue with very hard foods early on, which fades. Because injections sit deep in the masseter and away from the smile muscles, your expression stays natural with correct placement. The clinic’s doctors map the muscle carefully, which is why an experienced clinic matters for jaw treatment.
Adults with a wide or square jaw caused by an enlarged masseter, or with clenching and grinding, are ideal candidates. If jaw width comes mainly from bone, toxin alone will not change the shape and other options apply. A consultation confirms suitability. Explore related options on our injectable fillers page.
Masseter dosing is higher than for facial lines, individualised to muscle size and usually placed across about 3 points per side, as set by your doctor and described on our botox injection page. Larger muscles need more units; the doctor balances slimming with comfortable chewing function.
Yes, it pairs well with energy-based skin tightening for a loose jawline and with chin or jaw filler for definition. Your doctor sequences these safely in one plan for lower-face balance. To understand volume-based contouring, see our injectable fillers page for how fillers differ from muscle reduction.
Common effects are brief redness, mild tenderness, or temporary chewing fatigue that resolve within days to a couple of weeks. Less commonly, mild asymmetry or a transient sunken look beneath the cheek can occur, settling as the muscle balances. Serious reactions are rare with proper technique. Share your full medical history beforehand.
Botulinum toxin type A has a well-documented record for masseter reduction and bruxism when administered by trained doctors at appropriate depth and dose. Effects are temporary and reversible as chewing strength recovers over months. Choosing an experienced clinic and honest dosing matters far more than chasing the strongest possible slimming result.
Aftercare is simple: stay upright for about 4 hours, avoid massaging the jaw, and skip strenuous exercise, saunas, and alcohol that day. Stick to softer foods if chewing feels tired in the first weeks. Pairing with a gentle skin care routine supports the skin. Your doctor provides written guidance once you leave.
Jaw 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 remember the slimming itself appears gradually over weeks. Our English-speaking team helps schedule the appointment so it fits a short trip to Seoul.
Yes, you can fly the same day, since the treatment is quick and non-invasive. Try to stay upright during the first few hours and avoid massaging the jaw. Cabin pressure does not affect the result, and the slimming develops over the following weeks at home, so air travel after jaw botox is generally not a concern.
International patients can have remote check-ins in English at around 4 to 6 weeks, once the slimming has developed, to confirm 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.
| Masseter Botulinum Toxin Type A | Energy-Based Skin Tightening | Hyaluronic Acid Filler (chin/jaw definition) | |
|---|---|---|---|
| Mechanism | Reduces masseter muscle bulk | Heats dermis to tighten lax skin | Adds volume to redefine the jaw and chin |
| Best for | Square jaw from an enlarged chewing muscle | Sagging or loose jawline skin | Weak chin or undefined jaw angle |
| Pain / comfort | Brief deep pinprick sensations | Warmth during treatment | Mild pressure, often with numbing |
| Downtime | Minimal | Minimal | Possible swelling or bruising for days |
| Results timeline | Gradual over 4 to 6 weeks | Builds over weeks to months | Immediate volume |
| Longevity | About 4 to 6 months | Around a year, varies | Several months to a year |
| Sessions | Repeated every 4 to 6 months | Usually 1, with maintenance | Periodic top-ups |
| Cost context | Depends on units per side; set at consultation | Depends on device and area | Depends on volume used |
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