ok im 15..and everytime i eat sumthing...or chew anything...i bit a major hole in my cheek. it bleeds and everything.

my mom said it was my wisdom teeth...but ive been doin to for years now..since i was like 11..and it hurts really bad..i was wondering if i could stick something in the back of my mouth or if theres anything that will keep my teeth away from my cheeks...