I originally received temporalis muscle Botox at the dentist's office due to teeth grinding. I was injected with about 100 units at the time. Two weeks after the injection, I was amazed to see that the size of my head looked smaller from the front, and the teeth grinding and headaches I experienced while sleeping had completely disappeared. Surprisingly, the cosmetic effects are also quite significant. On the other hand, I do not recommend square jaw Botox! Not only does it significantly impair chewing function, but it also enlarges the temporalis muscles and cheekbones, altering your facial shape.
Since Botox can cause resistance, if you plan to get injections regularly, I recommend getting Xeomin, which does not cause resistance.
Also, if anyone who got square jaw Botox experienced the same side effects as me, I'm curious how you resolved it!