The more common causes of tooth bite pain are dentin hypersensitivity, tooth decay, periodontitis and chronic apical periodontitis. 1. Dentin allergy: dentin allergy is mainly manifested in the molar jaw will have some small concave enamel defects, when the teeth come into contact with food with acidic flavor will be easily stimulated, will therefore appear sore phenomenon. 2. Dental caries: If you do not pay attention to oral hygiene, resulting in dental caries, cavities, when the teeth come into contact with food, food is easily embedded in the cavity, so there will be soreness. 3. Periodontitis: Periodontitis is usually related to genetic factors or poor oral hygiene, the main symptom is that the gums will be red, swollen and bleeding, and there will be pain when biting something. 4. Chronic apical periodontitis: chronic apical periodontitis is usually related to various factors, such as chemical stimulation, bacterial infection, etc., the patient may have chewing weakness, biting toothache. It is recommended to actively go to the regular hospital for consultation, clear diagnosis, and follow the doctor’s instructions to adopt the appropriate solutions to avoid delaying the condition.