I am curious about the effects and duration of square jaw Botox.

Hello. I usually enjoy chewy foods like squid and have a habit of clenching my teeth while sleeping. Perhaps because of this, my jaw muscles are very developed, and I am concerned that my face looks angular. People around me have recommended square jaw Botox to make the face look slimmer, so I am writing this inquiry. Even in cases like mine, where the development is due to muscle rather than bone, can I achieve a satisfactory V-line effect with Botox treatment alone? I am curious about how long it usually takes for the jaw to slim down after the treatment, and how long the effects last after a single injection. I would also appreciate it if you could answer whether periodic injections are necessary to maintain the effect and if the procedure can be performed immediately upon a same-day visit.