Although the teeth filled, but still may occur again pain, there are many reasons for pain, specifically the following reasons: 1, teeth in the filling and secondary caries, secondary caries refers to the filling material and the original teeth and small gaps between the teeth, the teeth appeared further caries until the development of the pulp, which led to the emergence of pulpitis or periapical periodontitis, either pulpitis or periapical periodontitis, will cause severe pain in the teeth. 2, there may also be in the filling teeth bite into hard objects, there are cracked, cracked teeth may cause dentin, or pulp chamber exposure. 2, there may be after the filling teeth bite into hard objects, there is the case of fracture, tooth fracture may cause dentin, or pulp cavity exposure, resulting in hot and cold sensitivity of the teeth, or the emergence of obvious spontaneous pain. Once a patient experiences pain after a filling, the best solution is to go to the stomatology department of a general hospital or the endodontics department of a dental hospital for an examination to determine the cause of the disease, and then carry out targeted treatment.