Teeth that have been sore after vomiting can be relieved by rinsing the mouth with warm water and taking medication. Usually after the patient vomits, stomach acid will flow back into the mouth, causing irritation to the teeth and oral mucosa, thus producing the symptom of sour teeth. At this time, warm water can be used to gargle to discharge the stomach acid in the mouth to relieve the symptoms of tooth acid. Secondly, patients also need to use drugs for gastrointestinal diseases according to the cause of vomiting, such as omeprazole, which inhibits the secretion of gastric acid, and domperidone, which promotes gastric emptying, etc., to prevent tooth acid caused by vomiting. Patients must pay attention to a light and reasonable diet, and try to avoid eating spicy and stimulating foods. If the patient’s symptoms of tooth acidity are serious, it is recommended to seek medical attention in time and use medication under the guidance of the doctor, not to use medication privately, so as not to cause adverse effects.