Show patients their result before they treat.
Slimming an enlarged, square jaw caused by overdeveloped masseter (chewing) muscles.
Sarah Jenkins
Plan #4112 • Lower Face & Neck
Recommended Protocol
Neuromodulators
Botox • For Masseter Hypertrophy
Follow-Up & Touch-Up
Maintenance visit
Masseter hypertrophy is enlargement of the jaw's chewing muscles, often from clenching and grinding, creating a square or broad lower face. It's treated with neuromodulators like Botox or Dysport injected into the masseter, which relaxes and gradually slims the muscle into a softer V-shape while also easing clenching and jaw tension. Slimming develops over 4–8 weeks and lasts about 4–6 months.
Masseter hypertrophy is enlargement of the masseter muscles at the angle of the jaw, which can create a square or overly broad lower face. It is often linked to clenching and teeth grinding, and patients may want a softer, more tapered jaw shape — or relief from the jaw tension and headaches that accompany it.
Masseter treatment is a satisfying dual-benefit consult: it slims the lower face and relieves clenching, so it appeals to both aesthetic and functional patients. The provider's goal is to relax the muscle so it gradually slims into a more balanced V-shape over weeks. Showing the projected slimmer, softer jawline on the patient's own photo makes the gradual change tangible and books a treatment patients repeat every few months.
Masseter Hypertrophy
Where it appears
Jawline
Facial area
Lower Face & Neck
Treatment paths
6
From in-clinic procedures to at-home regimens, Afters maps the full range of options — so patients can see what each one would do for them, on their own photo, before they commit.
The named injectables, products, and devices patients search for — each lets them preview the result before they commit.
The original and most recognized wrinkle-relaxing injectable, made from botulinum toxin type A.
View brandGalderma's botulinum toxin type A, known for fast onset and a slightly softer, more diffuse spread.
View brandMerz's 'naked' botulinum toxin — purified with no complexing proteins added.
View brandEvolus's 'Newtox' — a botulinum toxin type A built specifically for aesthetics.
View brandRevance's longer-lasting botulinum toxin, formulated with a peptide instead of human or animal proteins.
View brandHugel's botulinum toxin type A — the #1 selling toxin in South Korea, now FDA-approved in the US.
View brandPatients rarely come in for just one thing. Browse other concerns Afters can visualize.
Common questions patients ask about masseter hypertrophy — and what practices should be ready to answer.
Overdevelopment of the masseter (chewing) muscles, frequently from habitual clenching or teeth grinding, enlarges the muscle at the jaw angle and widens the lower face.
Botox injected into the masseter relaxes the muscle so it's used less and gradually shrinks, softening a square jaw into a more tapered shape over several weeks.
Slimming typically develops over 4–8 weeks and lasts about 4–6 months. With repeated treatments the muscle can stay slimmer for longer between sessions.
Yes. By relaxing the masseter, it reduces clenching force, which can ease jaw tension, soreness, and grinding-related headaches alongside the slimming effect.
When dosed correctly, masseter Botox preserves normal chewing and expression. A skilled injector targets the right amount to slim the muscle without affecting function.
Afters simulates the outcome on a patient's own photo and builds a visual 12-month plan — so consults convert and average ticket climbs.