Sour teeth after eating prunes may be due to the acidity in prunes that irritates the teeth. First of all, you should stop eating prunes immediately, so as not to cause further aggravation of the symptoms of acidity, and then you need to treat the dental disease. 1. Rinse your mouth with water to remove as much acid as possible from the surface of your teeth, and brush your teeth to remove it thoroughly to relieve the symptoms of tooth acidity. During the period of tooth acidity, try not to eat food that can stimulate the teeth, such as: lemon, ice, etc., so as not to stimulate the teeth and aggravate the symptoms of tooth acidity. 2. If the symptoms of tooth acidity persist without relief, you should immediately consult a doctor to check whether there are dental and periodontal diseases, such as periodontitis, wedge-shaped defects, etc. According to the cause of the disease, choose systemic periodontal treatment, resin filling and restoration. Eating prunes teeth acid is generally normal, a period of time can be relieved. If the teeth are sore for a long time, you should consult a doctor immediately for diagnosis and treatment.