If your dentist suspects that a filling may be cracked or leaking, this may cause deposits and saliva to leak between the filling and the tooth. X-rays are taken to evaluate this situation. If your tooth is extremely sensitive, you need to call your dentist for an appointment if you feel a sharp edge, notice that the filling is cracked, or if part of the filling is missing. If such situations are neglected or deemed insignificant, they may lead to more important problems in the future. Therefore, it is necessary to intervene in advance.