Should I go to a dentist or cosmetic dermatologist for Botox to treat masseter muscle hypertrophy?

I've decided to get botox to help with the facial asymmetry from my bruxism. One of my masseter muscles has hypertrophy. I can't decide which type of provider would have the most expertise and experience with injecting the botox. I know cosmetic dermatologist do Botox injections regularly, however since this is bruxism would a dentist who does botox be better since he may see these type of cases more often