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

Masseter Botox is one of the most searched neurotoxin treatments, and for good reason. It can slim a wide or square jawline and ease the jaw pain that comes from clenching and grinding. Because the masseter is a large, powerful muscle, this treatment uses far more units than a facial line, so the cost works differently than forehead or crow's feet Botox.

What is masseter Botox?

The masseter is the thick chewing muscle on each side of your jaw, running from your cheekbone to the lower jaw. When botulinum toxin type A is injected into it, the muscle gradually relaxes and shrinks with use. Over weeks to months that produces two effects: a slimmer, softer jawline, and less force behind clenching and grinding. The same product used on the forehead, the glabella (the 11 lines), and crow's feet is used here, just at a higher dose.

Jaw slimming versus TMJ and jaw clenching

People come to masseter Botox for two main reasons, and they often overlap.

• Jaw slimming. A strong or enlarged masseter can make the lower face look wide or square. Relaxing the muscle slims the jawline over a few months for a softer, more tapered shape.
• TMJ, clenching, and grinding. An overactive masseter contributes to TMJ discomfort, jaw soreness, tension headaches, and worn teeth from bruxism. Weakening the muscle reduces that force, which can ease pain and protect the teeth.

Many patients want both at once, and the same injection achieves both the cosmetic and the functional benefit.

How many units per side?

The masseter needs far more product than a small facial muscle. A typical dose is about 20 to 30 units per side, or roughly 40 to 60 units total. Larger or very strong muscles, common in heavy grinders, may need toward the higher end, while a first session is often started conservatively and topped up at the follow-up. Your provider sizes the dose by feeling the muscle while you clench.

Masseter Botox cost ranges

Because cost is driven by units, the higher dose makes masseter Botox more expensive than a single facial area. At a per-unit price of $10 to $20, a full masseter treatment of 40 to 60 units typically lands between about $400 and $1,200, with most patients in the $500 to $900 range.

To estimate your own number by unit count and per-unit price, use our Botox cost calculator. Prices vary with your city and whether you see a medspa injector or a physician, so always get a per-unit quote.

How long does masseter Botox last?

Because the masseter is large and strong, results often last longer than facial Botox, commonly 4 to 6 months and sometimes more. The slimming effect builds over time: as the muscle is treated repeatedly, it stays smaller and you may need fewer units at later sessions. For TMJ relief, many people feel less clenching within a couple of weeks.

Sessions and what to expect

The appointment itself is quick, often under 15 minutes, with a few small injections on each side. You can return to your day right away, following standard aftercare. Jaw slimming is gradual, so expect to see the shape change over 6 to 12 weeks rather than overnight. Most people start with a session, return in a few weeks for any touch-up, then maintain every 4 to 6 months. Plan for 2 to 3 sessions in the first year to reach and hold your result.

Frequently asked questions

Does masseter Botox hurt? Most people describe only a quick pinch per injection. The muscle is deep, so discomfort is brief and mild.

Will my jaw slimming look obvious right away? No. Slimming is gradual over 6 to 12 weeks as the muscle relaxes and shrinks with use.

Can it help my teeth grinding? Often yes. By weakening the masseter, it reduces clenching force, which can ease TMJ pain and protect teeth, though a dentist or licensed provider should guide a bruxism plan.

Bottom line

Masseter Botox uses about 20 to 30 units per side and usually costs $400 to $1,200 per session, lasting 4 to 6 months. It is a strong option for both jaw slimming and TMJ or clenching relief. Get a per-unit quote, expect gradual results, and talk to a licensed provider about whether your muscle and goals are a good fit.

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