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Botox
Will repeated treatment of bruxism with Botox cause more masseter reduction?
Yes, in general. Each round of Botox to the masseter causes temporary disuse atrophy: the muscle fibers shrink because they're not contracting against resistance the way they normally would with clenching or grinding. Repeat that cycle every few months and the atrophy tends to compound, so most patients see progressively more slimming over the first several treatments. That said, there's a ceiling. Once the muscle reaches its new, smaller baseline size, additional sessions mainly maintain that result rather than shrinking it further. How much reduction you get also depends on your starting muscle bulk, dose used, and how strong your clenching habit is. Without an exam I can't say where you are on that curve from a photo alone, but a board-certified plastic surgeon or dermatologist can palpate the muscle during clenching and tell you whether there's more room to slim down or whether you're near your plateau.
Clinical Context
Masseter Botox for teeth grinding is an off-label use, though widely practiced and generally well tolerated. The muscle-slimming effect builds gradually with repeated treatments, and most people notice the biggest changes over the first several sessions. Results vary based on jaw muscle size, dose, and grinding habits, so photos alone can't predict your outcome. If treatment stops, the muscle typically returns toward its original size and strength over several months as normal clenching activity resumes.
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