Masseter Botox Cost: Units, Pricing, and What to Expect (Jaw Slimming and TMJ)

By Chris Terry, Botox Aficionado
Updated 2026-06-17

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Masseter Botox costs roughly $600 to $1,500 per session for both sides, based on 40 to 60 total units at $15 to $25 per unit. It is one of the more unit-heavy treatments because the masseter (the large chewing muscle at the jaw angle) is strong and needs a meaningful dose to relax.

How many units for masseter Botox?

Most people need 20 to 30 units per side, so 40 to 60 units total. Larger or stronger jaw muscles, common in men and in people who clench or grind heavily, can need up to 40 units per side. Your injector assesses your muscle by having you clench, then doses accordingly.

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

Jaw slimming vs TMJ relief

Masseter Botox is used for two overlapping reasons. Cosmetically, relaxing the muscle slims a square or wide jawline over a few weeks for a softer lower-face shape. Medically, it eases TMJ pain, jaw tension, teeth grinding (bruxism), and tension headaches by reducing how hard the muscle clenches. Many patients get both benefits from the same treatment.

Will insurance pay for Botox for TMJ?

Sometimes, but it is inconsistent. When masseter Botox is done purely for jaw slimming, it is cosmetic and not covered. When it is done to treat diagnosed TMJ disorder, bruxism, or chronic tension headaches, some medical and dental insurers will cover part of it, usually after you have tried conservative options like a night guard first. Coverage varies widely by plan, so ask your provider to submit a pre-authorization with the medical diagnosis codes before you assume it is covered. If it is approved, you typically owe a copay or coinsurance rather than the full cash price.

How long does masseter Botox last?

Longer than facial wrinkle treatment, usually 4 to 6 months, because the dose is larger. With repeat treatments the muscle can shrink slightly over time, so some people find they need fewer units or less frequent visits to maintain the result.

What to expect

Results build gradually. Jaw slimming becomes visible over 4 to 8 weeks as the muscle relaxes and reduces in bulk.
Minimal downtime. You can return to normal activity the same day.
Chewing may feel slightly different for a week or two as the muscle adjusts; this is normal.

Masseter Botox side effects

Most side effects are mild and temporary. You may notice brief soreness, minor bruising, or a feeling that your bite is slightly weaker for the first week or two while the muscle adjusts. A small number of people get an "uneven smile" if the product affects nearby muscles; choosing an experienced injector minimizes this. Serious side effects are rare. Because the masseter is a large muscle, proper placement matters more here than for delicate facial areas.

Is masseter Botox worth the cost?

For chronic clenchers and people with jaw tension or TMJ pain, many feel it is among the highest-value Botox uses because it addresses both comfort and appearance. For purely cosmetic jaw slimming, weigh the $600 to $1,500 per session against the 4 to 6 month duration. Buying during a clinic event or using Allē rewards lowers the effective price.

Masseter Botox FAQ

Will it change my smile? When dosed and placed correctly, no. Temporary changes resolve as it wears off.
How soon can I eat? Right away. Just avoid intense chewing (gum, tough meat) for the first day.
Can it replace a night guard? It can reduce clenching force, but many providers use it alongside a guard rather than instead of one.

See the full cost guide for per-unit pricing in your area and how long results last.

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