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Botox
Can a Botox masseter jaw reduction change my jaw shape or do I need surgery?
Yes, Botox can soften a square jaw shape by weakening the masseter muscle so it gradually shrinks with disuse — this works well for jaw slimming when the issue is muscle bulk from clenching or grinding. It won't touch bone width or fat, though, so if your fullness is coming from those structures, Botox alone won't get you the change you want. Without an exam it's hard to say which factor is driving your case; a general question with photos really needs an in-person look to sort out muscle versus bone versus soft tissue. Often the best result comes from a combination: masseter Botox for muscle bulk, plus chin or jawline contouring if the skeleton itself needs more definition. See a board-certified plastic surgeon for an assessment before deciding whether Botox alone will do it or whether a surgical component makes sense.
Clinical Context
Whether Botox alone can reshape your jaw hinges on what's actually causing the width you see: masseter muscle bulk, underlying bone structure, jaw angle flare, or fat and skin laxity along the jawline. Botox only addresses the muscle portion, softening it as it shrinks from reduced activity over time. If bone or fat contribute meaningfully to your shape, Botox will help but won't fully deliver the slimmer profile you're picturing. Photos can't reliably separate these factors, so an in-person exam is really needed before deciding whether Botox alone suffices or a surgical option should be discussed.
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