According to the time and nature of the pain, there are several possibilities of caries, dentin allergy and pulpitis, which need to be treated with filling, anti-allergy treatment and root canal treatment. 1. Caries: the main manifestation is pain caused by sweet stimulation, the pain is relieved immediately after the sweetness disappears, and the carious cavities can be seen on the surface of the teeth. It can be cured by removing the decayed tissues and filling the cavity. 2. Dentin hypersensitivity: mainly manifested as soreness and pain, the pain disappears immediately after the sweet taste is removed, common teeth cervical wedge-shaped defects and excessive wear of teeth, desensitization treatment for mild cases, serious cases, wedge-shaped defect filling treatment, excessive wear of teeth crown restoration. 3. Pulpitis: mainly manifested as sweet taste stimulation pain, the pain continues for a period of time after the removal of sweet taste to relieve, common caries spread to the pulp, the need for root canal treatment. It is recommended to go to the regular hospital stomatology department as soon as possible, by the physician after the examination of a clear diagnosis, and the cause of the treatment.