Fillings are done to reduce the level of pain someone has if they present with discomfort. They are also done to prevent serious infections if left untreated. When fillings are done, your dentist will go over what to expect.  Deeper restorations require more care and are situated closer to a tooth’s nerve endings, and these procedures have the potential to cause discomfort. Adequate local anesthetic is important to provide great quality of care and ensure comfort. Your tooth may feel discomfort or sensitivity a few days after a procedure. Mild discomfort is normal and temporary.  Significant and prolonged discomfort may be a sign of a problem. Contact your dentist immediately.