Sour teeth need to be relieved by cleaning, changing toothpaste and medication to address the cause. 1. Teeth cleaning: Sour teeth are considered to be the cause of dental calculus, teeth cleaning is not in place, resulting in dental calculus attached to the teeth. You can go to a regular dentist to do ultrasonic scaling to remove the calculus. 2. Change the toothpaste: teeth sour, you can use toothpaste for teeth sensitivity, can play a protective role on the teeth, such as anti-allergy toothpaste. 3. Medication: Sour teeth is considered to be the cause of periodontitis, you can take metronidazole tablets, tinidazole tablets and other medications under the advice of the doctor to treat tooth pain, and need to carry out systemic periodontal therapy. If the symptoms of sour teeth are not relieved, you should go to the hospital in time to avoid self-medication. Normally, you should develop good dental habits.