There is no way to stop acidity immediately. Sour teeth may be caused by physiological factors such as eating hot and cold food alternately; it may also be caused by diseases such as dental caries and periodontitis, etc. According to different causes, we can adopt appropriate treatments according to the doctor’s instructions, such as general treatment, medication, surgery, and so on. 1. Physiological factors: If acidity is caused by eating acidic food, alternating hot and cold food, it is recommended to adjust the dietary habits, keep the diet warm and light, and do not eat too hard food. Don’t use too hard toothbrush to reduce the damage to the teeth. 2. Dental caries: If dental caries leads to dental acidity, it is recommended that patients keep their mouths clean and eat less sweets. Can follow the doctor’s advice to use composite resin material on the caries part of the filling treatment. If the damage to the nerve, you can follow the doctor’s advice for root canal treatment. 3. Periodontitis: If periodontitis leads to tooth acidity, patients can follow the doctor’s instructions to use supragingival scaling, subgingival scraping and other methods of treatment to remove tartar. Patients can also follow the doctor’s instructions oral metronidazole, tinidazole and other antibiotic drugs, to play the effect of anti-inflammatory sterilization. After excluding physiological factors, it is recommended that patients with toothache go to the hospital for treatment, and adopt appropriate treatment according to the cause of the disease as prescribed by the doctor.