If the filled tooth hurts when you eat, but not when you don’t eat, there may be occlusal high spots, pulpal congestion or apical inflammation. 1. Occlusal high point: the filling material is too high, and when eating, the filled tooth has occlusal high point which leads to stress concentration, thus making the tooth painful and uncomfortable. 2. Pulp congestion: The decay of the tooth is close to the nerve of the tooth, and the filling will make the pulp congestion more serious, which will lead to occlusal pain of the tooth. 3. Apical inflammation: after root canal treatment, the root tip inflammation is not controlled, and biting pain will also occur. The tooth filled with pain when eating, it is best to go to the hospital in a timely manner, after a professional doctor’s examination, to clarify the causes of tooth pain, and then symptomatic treatment, is conducive to the recovery of the condition.