Dental fillings still hurt may be the result of diagnostic errors, irritation from filling operations and materials, and the presence of occlusal high spots after the filling. 1. Diagnostic error: the bacteria in the cavity before the tooth filling has in fact been infected to the pulp, so only filling is not enough, but also need to carry out root canal treatment. After only filling the tooth, there will also be pain and other symptoms of pulpitis. 2. Stimulation of filling operation and materials: there may be some reaction to the pulp, which can be recovered after a period of time. 3. Existence of occlusal high point after filling: occlusal high point after filling will appear occlusal pain. Dental fillings may also have other causes of pain, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.