Infrequently, injecting botulinum toxin type A (Botox, others) into the jaw muscles used for chewing may relieve pain associated with TMJ disorders. TMJ arthroscopy. In some cases, arthroscopic surgery can be as effective for treating various types of TMJ disorders as open-joint surgery.
https://www.mayoclinic.org/diseases-conditions/tmj/diagnosis-treatment/drc-20350945

