If your tooth hurts after biting something hard, you should go to the hospital to check whether it is damaged by dentin or periodontium, and carry out root canal treatment or jaw adjustment according to the situation. 1. Dental injury: biting and eating hard objects may cause fissure, if the fissure line reaches the dentin, dentin sensitivity can occur, the external stimuli can be sore, according to the situation of the resin repair or crown repair, if the cause of inflammation of the pulp need to carry out endodontic treatment after the crown repair. 2. Periodontal injury: biting into hard objects may also cause dental shock, periodontal membrane damage around the root, need to adjust the jaw fixed observation, the general symptoms will be slowly reduced, the emergence of pulpal inflammation requires root canal treatment. Biting and eating hard objects with pain may also be a longitudinal fracture of the root of the tooth, this time the need for tooth extraction, the specific measures recommended to the hospital in a timely manner to check and then deal with the specific measures.