Sour teeth the day after drinking may be due to drinking cold beer, alcohol stimulation of teeth and vomiting. 1. Drinking cold beer: itself due to excessive wear and tear, trauma and local lesions and become sensitive dentin, if then stimulated by cold beer, there can be a local allergic phenomenon, the immune cells release histamine, can cause tooth acid. 2. Alcohol corrosion of teeth: If you drink a large number of high concentration of white wine, so that the teeth are exposed to the ethanol concentration is too high, can lead to alcohol stimulation of existing caries, resulting in acidic teeth. 3. Vomiting: If you vomit because of drinking, the food mixed with stomach acid will come into contact with your teeth during the process of vomiting from your mouth, and if you don’t rinse your mouth in time or rinse your mouth incompletely, the stomach acid will erode your teeth and cause them to become acidic. If you drink the next day tooth acid, you should go to the regular hospital in time to find out the cause of the disease, and under the guidance of a professional doctor to choose a suitable method of treatment.