Inquiry regarding the typical duration of square jaw Botox

I have a habit of clenching my teeth, so it stresses me out every time I look in the mirror because my jaw muscles look developed, making me look like I have a square jaw. I would like to get Botox at Maypure to slim down my jaw muscles. I am curious how long the effects typically last after square jaw Botox appears and is maintained. I know it varies from person to person, but if you could let me know how often people usually get injections a year, I would like to use that as a reference.

Taking care of my skin is difficult.