My teeth cracked?

ok i had fillings on my top molar tooth and my bottom molar tooth on my left side.
the filling got out like a few months ago from eating hard foods but the dentist was like the fillings not supposed to pop out or something. so he re filled it and now i can feel the molars and i feel a crack a or a line on the side of the tooth. like i run my nail across and intead of a smooth tooth my nail runs into a ridge or something. does that mean its cracked? if it is what should i do to avoid the tooth from getting worse?

Answer:
It could be the line where the filling and tooth meet. Also, it could be a fracture of the tooth. I would call my dentist and have it checked. Good Luck!
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