Masseter Botox Dosage: How Many Units Do You Actually Need?
Masseter Botox typically uses 30–60 units total — 15–30 per side. Below 25 units per side you may achieve mild bruxism relief but rarely visible slimming. Men generally need more units than women due to larger, stronger masseter muscles. Under-dosing is the single most common reason masseter Botox "doesn't work".
Quick Answer
- Bruxism relief (mild): 20–25 units per side
- Bruxism relief (severe): 25–35 units per side
- Visible jaw slimming (women): 25–35 units per side
- Visible jaw slimming (men): 30–40 units per side
- First treatment minimum: 25 units per side — anything less risks no result
Two Goals, Two Doses
Masseter Botox is requested for two distinct reasons — and the dose depends on which one you want. Bruxism (teeth grinding, clenching, jaw tension, tension headaches) responds to lower doses because partial muscle weakening is enough to break the grinding cycle. Cosmetic jaw slimming requires the muscle to atrophy enough to visibly narrow the lower face — and atrophy is dose-dependent.
At CosmeDocs, we always confirm your goal before deciding the dose. A patient who wants both — relief and slimming — almost always sits in the 30–35 units-per-side range.
Dosing Table
| Goal | Women / side | Men / side | Total |
|---|---|---|---|
| Mild bruxism only | 20 | 25 | 40–50 |
| Severe bruxism | 25–30 | 30–35 | 55–65 |
| Cosmetic slimming | 25–35 | 30–40 | 55–75 |
| Slimming + bruxism | 30–35 | 35–40 | 65–75 |
Why Repeat Treatments Slim More
Masseter atrophy is cumulative. A first treatment shrinks the muscle by roughly 20–30%. A second treatment four to six months later (before the muscle fully recovers) compounds the effect — by the third or fourth session, many patients reach a stable slimmer jawline that holds for 6–9 months between top-ups. This is why budgeting masseter Botox as a 12–18 month project, not a single session, gives the best long-term result.
The "20-unit special" warning
Some clinics advertise masseter Botox at 20 units total (10 per side) to hit a low headline price. At that dose, the muscle is barely weakened — bruxism returns within weeks and there is no slimming. You then assume Botox does not work for you, when in fact you were under-dosed. Always ask the per-side unit count before booking.