Please recommend a Botox injection schedule to slim down my wide, square jaw!

I usually enjoy chewing tough foods and have a habit of clenching my teeth while sleeping, so the muscles under my ears and jaw have become unusually thick. When I look in the mirror from the front, my lower face looks wide and square, which stresses me out because it makes my impression look rough. Therefore, I am planning to get a cost-effective square jaw Botox treatment. To safely maintain a slim V-line for a long time without worrying about resistance, is it standard practice to schedule Botox injections at intervals of about every month? It would be very helpful for my consultation if those of you who maintain a slim jawline with regular Botox could share tips on your injection schedule and the level of soreness you experience after the procedure. !