Pain after filling is related to individual physique, tooth condition and skillfulness of clinic staff, some fillings will not be painful, some fillings may be painful for a week or so. 1. pain after filling if deep caries filling, the body is stimulated by external mechanical drugs may produce temporary reactive pain, generally a week or so the pain can slowly disappear, if the pain aggravated by the consideration of bacteria to the pulp, resulting in pulpitis, the need for root canal treatment to solve the pain. 2. Pain after filling if the filling has been done root canal treatment, may be the root filling material stimulation caused by pain, normal one to two weeks pain disappears, if the pain persists or aggravated may be microbial infection or cyst, need to re-root canal treatment or apical surgery. Subject to individual physical and other factors, the pain is usually about a week, if the pain continues to intensify, it is recommended to go to the hospital in time to deal with.