The main reason for the pain is the presence of tooth decay, tooth allergy, periapical infection, tooth fracture and wear, which need to be treated according to different diseases in order to relieve. 1, tooth decay: tooth decay will erode the surrounding tissues, and when the cavity is formed, the bacteria will enter and infect the tooth pulp, causing pain, which may occur when the patient bites something with the tooth. Patients with dental caries can take filling treatment, and if necessary, root canal treatment is needed; 2, tooth allergy: when the tooth is exposed or worn out because of dentin, pain will appear when it is stimulated by cold, heat and friction or biting something. In this case, patients are advised to apply desensitizers for treatment under the guidance of a doctor; 3, periapical inflammation: when the tissue of the pulp is necrotic, external impact or bacterial infection, it will cause inflammation around the root tip, when biting something will touch the tooth, resulting in pain at the root tip, root canal treatment can be taken; 4, tooth fracture or wear: trauma or poor eating habits, often eat hard food may lead to patients Tooth fracture or wear, when biting something with teeth can appear painful symptoms. In this case, the doctor needs to take appropriate treatment according to the specific situation of the tooth, usually with braces, and if necessary, extraction. Patients are advised to pay attention to maintaining oral hygiene and preventing inflammation in general. If the toothache is more serious, oral treatment with non-steroidal anti-inflammatory drugs, such as ibuprofen and indomethacin, can be taken under the guidance of a doctor. At the same time, attention should be paid to a light diet and avoid eating too hard food.