What Is Jaw Botox?
Masseter BTX involves injecting botulinum toxin into the masseter muscles — the large chewing muscles on either side of the jaw. The toxin relaxes the masseter over 4–8 weeks, reducing its bulk and creating a slimmer, more tapered lower face. It is also a medically valid treatment for bruxism (teeth grinding) and TMJ pain.
How Does It Work?
Botulinum toxin blocks acetylcholine release at the neuromuscular junction, causing temporary muscle relaxation. With reduced activity, the masseter gradually atrophies over 4–8 weeks. The result is a slimmer lower jaw angle and a gentler transition from face to neck.
Results Timeline
Initial muscle relaxation: 5–7 days. Visible face slimming: 4–8 weeks. Full aesthetic effect — a noticeably slimmer and more defined lower face: 8–12 weeks. Results last 4–6 months initially. With repeat treatment, many patients find the masseter remains smaller for longer and lower maintenance doses are needed.
The V-Shape Combination — Jaw BTX + Chin Filler
The most effective non-surgical V-shape face combination pairs masseter BTX (jaw angle slimming) with chin projection filler. BTX reduces muscle bulk at the jaw angle over 4–8 weeks; chin filler adds definition at the chin tip — together creating the tapered, balanced V-shaped face profile popular in Singapore. Dr Sin Yong typically plans both in the same session, placing chin filler to complement the anticipated masseter reduction.
Safety Considerations
Common complications from poor technique include asymmetric results, temporary chewing difficulty from over-dosing, and paradoxical jaw widening from incorrect injection point (sublingual space rather than muscle body). All masseter BTX at IN Eternity Clinic is performed personally by Dr Sin Yong, with masseter thickness and symmetry assessed before each treatment. Follow-up at 4 weeks allows correction of early asymmetry if needed.
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All treatments performed personally by Dr Sin Yong at Orchard Road, Singapore.
WhatsApp +65 8023 7170Frequently Asked Questions
Results typically last 4–6 months. With regular treatment, the masseter gradually reduces and many patients eventually need only once or twice yearly maintenance.
Minimal discomfort. The masseter is a large, accessible muscle. Topical numbing cream is applied. Treatment takes approximately 10–15 minutes.
Over-treatment causing excessive reduction is a known complication. Dr Sin Yong uses conservative initial doses and assesses response at follow-up before recommending top-up. The goal is a naturally slimmer jaw — not a gaunt appearance.
Yes. Both men and women benefit from masseter BTX. Men typically require higher doses due to greater muscle mass. For men, the goal is usually to soften a very square jaw rather than create a V-shape — proportions differ.