Would I be able to achieve a slimmer face shape with masseter Botox? (Photo)

Thank you for your question. Chewing gum often would work the masseter muscle, causing hypertrophy just like any other muscle. Botox has been clinically shown to reduce masseter prominence, but the downside is that it has to be repeated every few months. I would start with that modality before jumping to a surgical solution unless you're 100% sure you want a slimmer jaw and want a permanent treatment. I hope that's helpful to you, and all the best.
-Dr. P

From your photo it appears you would be a good candidate for masseter Botox. This will help slim the jawline with results lasting approximately 3 to 4 months. See an experienced injector near you for treatment.

Hi Derek,
Yes, injecting Botox into the masseter muscles results in narrowing of the lower third of the face at the angle of the jawline. The treatment usually lasts for 3 to 5 months. It also helps relieve TMJ pain and teeth grinding. Stopping gum chewing will not likely help. Good luck and be well.
Dr. Persky
Encino, CA