If it appears that the tooth hurts when you bite something, there are three diseases that are more common, and different treatment methods are taken for different diseases. First, the tooth has a periapical inflammation, and the tooth will be affected by the inflammation of the root tip when the tooth is under stress, making the tooth chewing painful and requiring root canal treatment surgery for the tooth. Second, the tooth itself has a split or hidden tooth crack, there will be obvious fixed point pain when biting, need to be different treatment according to the degree of tooth split, relatively light directly repair filling treatment, more serious may need to carry out root canal treatment. If the longitudinal splitting reaches the root of the tooth, the tooth basically needs to be extracted. Thirdly, if the tooth is decayed and there is a large cavity, the pain occurs when the food is embedded in the cavity after biting, the treatment is mainly to carry out the filling treatment of tooth decay.