Tight enlarged jaw muscles near my temples... facial distortion ... botox therapy?

TMD: I would advise seeking an opinion on the status of your jaw joint or jaw muscles before embarking on Botox therapy. Spasm of the temporalis muscle may be due to jaw clenching.

Maybe but C MD 1st: Botox therapy could perhaps cause atrophy and some relief of the muscle spasms but it is better to first determine the cause of the problem.

Possibly: Botox therapy may be helpful for you. You may also need splint therapy... A night guard that you wear to reduce clenching or grinding your teeth which works the muscles and makes them larger. Your dentist and oral surgeon will work together to make this therapy work well for you.