How Long Does Masseter Botox Last? Duration, Results, and What to Expect
How Long Does Masseter Botox Last? Duration, Results, and What to Expect
Masseter Botox has become increasingly popular for facial slimming, jawline contouring, and TMJ relief—but one of the first questions many people ask is: How long does it last? And is it a permanent solution?
The short answer: Masseter Botox typically lasts 3 to 6 months depending on your body, goals, and how regularly you maintain it. It’s not permanent, but with consistent treatments, results can improve over time. Here’s how it works and what to expect.
What Is Masseter Botox?
The masseter is one of the major muscles involved in chewing. In some people, it becomes enlarged due to genetics, jaw clenching, or teeth grinding—leading to a square or bulky lower face.
Masseter Botox works by relaxing this muscle, softening the jawline and reducing tension. Depending on your goals, it’s used for:
Cosmetic facial slimming
Managing TMJ (temporomandibular joint) pain
Reducing teeth grinding or jaw clenching (bruxism)
How Long Does It Take to See Results?
Unlike forehead or crow’s feet Botox, masseter Botox takes longer to show visible changes. You’ll likely notice:
Improved TMJ symptoms: May occur within days to weeks
Muscle softening: Begins around 2–4 weeks after injection
Slimmer jawline: Becomes more noticeable after 4–6 weeks
The reason for the delay? It takes time for the muscle to atrophy slightly after being relaxed, which is what creates the slimmer look.
How Long Does Masseter Botox Last?
For most patients, masseter Botox lasts between 4 and 6 months, although results can vary. Factors that affect duration include:
Muscle strength: Stronger masseters may require more frequent treatments
Your metabolism: Faster metabolisms may break down Botox quicker
Treatment goals: Cosmetic jaw slimming typically requires ongoing maintenance
If you’re new to Botox, expect to return for touch-ups every 4-6 months at first. Over time, you may be able to extend the time between visits as the muscle weakens, it shrinks, and is used less.
Is Masseter Botox Permanent?
No—masseter Botox is not permanent. While results can last several months, the effects will wear off as your body metabolizes the neurotoxin.
However, repeated treatments can have a compounding effect:
The muscle gradually becomes smaller
Clenching or grinding habits may reduce over time
You may need less product or fewer sessions over the same period of time
That said, if you stop treatment altogether, the muscle will gradually return to its previous size and function.
If your concern is rooted in aging features or your considering broader facial enhancements, Juvederm or other non-surgical facial treatments can provide comprehensive results.
Who Is a Good Candidate for Masseter Botox?
Masseter Botox is safe and effective for many people. It’s especially helpful if you:
Have a wide, square, or boxy jawline you’d like to soften
Clench or grind your teeth
Experience jaw pain or TMJ tension
Want a non-surgical alternative to jawline contouring
During your consultation, a provider will assess your facial anatomy, bite function, and goals to determine if it’s the right choice for you. If you’re new to aesthetic treatments, we have an age guide to Botox with more information about it’s uses and when.
Choose a Provider With Facial Expertise
Because masseter Botox affects both aesthetics and function, it’s essential to work with a provider who understands facial anatomy and symmetry—ideally, a board-certified plastic surgeon or facial specialist.
At Stratus Plastic Surgery, we create customized Botox plans that balance aesthetics with long-term facial health. Whether your goal is to slim your jawline or reduce painful clenching, we tailor every treatment for natural-looking, safe, and effective results.
Ready to Try Masseter Botox? Let’s Talk
If you’re considering masseter Botox for TMJ relief or jaw slimming, understanding how long it lasts is just one part of the picture. With the right provider and maintenance, the benefits can be long-lasting and even life-changing.
Schedule a consultation with Stratus Plastic Surgery to find out if masseter Botox is right for you—and how we can help you achieve a softer, more balanced look without surgery.