Dental Botox for teeth grinding. Bruxism. WIll it change the look of my face at all?

It could with repeated treatments. Your jawline may become less squared and more tapered. However, it's important to talk to your injector about the effects if you are concerned.

One of the four muscles involved in chewing, the masseter muscle, is targeted during treatment with Botox.  When this muscle is unable to contract, it will reduce strain and bruxism but will also cause the muscle to become smaller over time.  With serial treatments, the jawline and lower third of the face will become slim and more tapered.  

We treat bruxism with Botox regularly at our clinic very successfully and it has shown a reduction in the muscle activity resulting in less pain and teeth grinding. The masseter muscle (large muscle that moves your jaw) is injected with Botox every 3-5 months depending on the muscle strength. Cosmetically it lengthens or softens the jawline. It is important to go to an accredited injector with a lot of experience. Good luck!