Face Slimming Singapore — BTX Jaw Slimming & V-Shape Face 2025 Guide

What Is Masseter BTX?

Masseter BTX involves the injection of BTX into the masseter muscles — the large jaw muscles on either side of the face. By reducing the contractile activity of the masseter, BTX causes the muscle to atrophy over 3–4 weeks, reducing lower face width and creating a slimmer facial shape.

BTX Dosing for Jaw Slimming

Dr Sin Yong's typical dose for jaw slimming is 16–20 units per side, calibrated to the individual patient's masseter mass and expression strength. Potency units are specific to each formulation's own assay and are not directly comparable to units of other BTX products. Onset is visible within 7–10 days, with full masseter atrophy evident at 4–6 weeks.

How Many Sessions Are Needed?

Most patients see significant slimming after a single session. Repeat treatments typically needed every 4–6 months initially. As the masseter atrophies progressively with repeated treatment, the interval between sessions extends. Some patients require only annual maintenance after 2–3 rounds.

Face Slimming Beyond the Masseter

For patients where masseter reduction alone is insufficient: chin filler adds vertical length and reduces relative width; jawline filler creates a more angular jaw that reads as narrower; Time Freeze Laser LCLR lipo-remodelling reduces facial fat deposits.

Who Is a Good Candidate?

Masseter BTX is most effective when apparent facial width is primarily due to muscle bulk rather than bone structure. Patients with wide jaw bones will not achieve full width reduction from BTX alone. Dr Sin Yong assesses the primary cause of facial width at consultation.