I've been injecting the Temporalis Muscle with Botox for 18 years
One of the first areas I started treating with Botox in 1994 was the Temporalis area. This was done for TMJ disease to weaken the "chewing" muscles to improve the associated headaches and muscle strain. You should look for a physician who treats TMJ with Botox. Keep in mind that the joint pain from TMJ arthritis or disc disease in no much improved with Botox, but the tension headaches and aches of the "muscles of masication" is improved.