Hidden pain after a filling may be normal, or it may be caused by other problems such as loose material or nerve of the tooth. Depending on the situation, general measures, re-filling, root canal treatment and other measures are needed. 1. Normal phenomenon: the day of filling the tooth hidden pain, may be due to deeper caries, filling materials have some irritation, resulting in filling the tooth after the feeling of pain, is a normal phenomenon, do not need special treatment. Pay attention to oral hygiene, light diet, avoid eating hot or cold food. 2. Loose material: After filling a long time, the teeth still have hidden pain, may be caused by the loosening of the filling material. Need to check whether the filling material is loose, if loose, need to be refilled. 3. Other: If the filling material is not loose, it may be caused by dental neuropathy, which needs to be relieved by root canal treatment. The symptoms of hidden pain in the tooth after filling, should be timely to the hospital, active treatment, to avoid the development of the disease.