I have a hole behind my right molar. It s been there for around a month or so (that i ve noticed, at the very least). It makes eating sometimes difficult because, if food gets into it, it hurts. I can t figure out what caused it. There was no extreme pain, or any kind of problems with my teeth in the past that might ve led to this. I ve never even had a cavity. I take relatively good care of my teeth and mouth, so it s a mystery to me how this hole came to be. The area around the hole does not look too inflamed.