Masseter Botox Cost: Units, Pricing, and What to Expect (Jaw Slimming and TMJ)
Contributing Writer, Encore Editorial · Updated 2026-07-08
Masseter Botox runs about $600 to $1,500 for both sides of the jaw, built from 40 to 60 total units priced at $15 to $25 each. It is one of the pricier single treatments on this site because the masseter, the muscle that powers chewing, is thick and strong and needs a real dose to relax.
Jaw slimming and TMJ relief are the same injection
Masseter Botox serves two overlapping goals from one treatment. Cosmetically, relaxing the muscle narrows a square or heavy jawline over several weeks. Medically, the same relaxation eases TMJ pain, tension headaches, and bruxism (teeth grinding) by lowering how hard the muscle can clamp down. Many people book it for one reason and notice the other benefit within a month.
Units and cost by goal
Your injector checks the muscle by having you clench your jaw, then doses based on its size and how developed it is. Men and heavy grinders often sit at the higher end.
| Goal | Units (both sides) | Typical cost |
| Jaw slimming (slight) | 40 | $600 to $1,000 |
| Jaw slimming or TMJ (moderate) | 50 | $750 to $1,250 |
| Strong clenchers (heavy) | 60 | $900 to $1,500 |
FAQs
Will masseter Botox change the way I smile?
When it is dosed and placed correctly, no. If a nearby muscle is affected, any change is temporary and resolves as the product wears off over a few months.
Can I eat normally right after treatment?
Yes. Ordinary eating is fine the same day. Skip intense chewing, like gum or tough meat, for the first 24 hours while the product settles.
Does masseter Botox replace a night guard for grinding?
Not usually. It reduces how hard the muscle can clench, but most providers use it alongside a night guard rather than as a swap for one.
Whether insurance will pay
Coverage is inconsistent. Pure jaw slimming is cosmetic and not covered by any plan. Treatment for a diagnosed TMJ disorder, bruxism, or chronic tension headaches sometimes gets partial coverage from medical or dental insurers, usually only after you have tried a night guard first. Ask your provider to submit a pre-authorization with the diagnosis codes attached before assuming your plan will pay; if it does, you will likely owe a copay rather than the full cash price.
How long results hold
Longer than a typical wrinkle treatment, usually 4 to 6 months, because the dose is larger and the muscle is bigger. With repeat sessions the masseter can shrink slightly, and some patients eventually need fewer units or less frequent visits to keep the same result.
What the first few weeks look like
- Slimming builds gradually. Visible change in jaw width takes 4 to 8 weeks as the muscle relaxes and loses bulk.
- Downtime is minimal. Most people go back to normal activity the same day.
- Chewing can feel a bit different for a week or two while the muscle adjusts, which is expected.
Side effects specific to this area
Because the masseter is a large muscle, placement matters more here than for smaller facial areas. Expect possible soreness, minor bruising, or a slightly weaker bite for a week or two. A small number of people notice an uneven smile if product reaches a neighboring muscle; an experienced injector lowers that risk. Serious complications are rare.
Is it worth the price?
For chronic clenchers and people with jaw tension, many find it worth the cost because one treatment addresses both comfort and appearance. For purely cosmetic slimming, weigh the $600 to $1,500 session against the 4 to 6 month window before you need another. Booking around a clinic promotion or using loyalty points can bring the per-session number down.
For per-unit pricing across other areas, see the full cost guide.
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