Tooth pain when eating hard things may be caused by apical periodontitis, fissure, fracture, occlusal imbalance, according to the situation to choose root canal treatment, full crown restoration, extraction, adjust the bite and other treatment measures. 1. Periapical periodontitis: If the tooth hurts when you eat hard things due to periapical periodontitis, you need to carry out root canal treatment on the tooth in time, and after the inflammation at the root tip of the tooth disappears, it will no longer hurt when you eat hard things. 2. Cracked tooth: if the tooth is cracked and it is painful to eat hard things, you can have a full crown restoration after the tooth has been treated. 3. Fractured tooth: If the tooth is fractured and the fracture has reached the root of the tooth, there is little point in retaining the tooth, and the tooth needs to be extracted in time. 4. Occlusal imbalance: the teeth hurt when eating hard things due to the existence of occlusal high points, this situation needs to be timely grinding out the occlusal high points, the teeth will no longer be painful. Teeth hurt when eating hard things need to go to the hospital in time, after the cause of the disease is clear and active treatment, in order to reduce the symptoms of tooth pain.