Sweet mouth may be caused by eating a lot of sweets, diabetes, indigestion, etc. It is best to gargle, take metformin, domperidone and other medications to solve the problem. 1. Eating a lot of sweets: After eating a lot of candy, desserts, sugar cane, watermelon and other sugary foods, part of the food residue is retained in the mouth, which will physiologically cause sweet mouth. The best way to solve this problem is to rinse your mouth with water and brush your teeth repeatedly. 2. Diabetes mellitus: The glucose level in the blood of patients with this disease is elevated, and too much glucose enters the salivary glands and is secreted into the mouth with saliva, so it will cause sweet mouth. It is best to take metformin, dagliflozin, biagliflozin and other hypoglycemic drugs or subcutaneous insulin injections as prescribed by the doctor, together with low-fat and low-calorie diets and reasonable exercise to solve the problem. 3. Indigestion: Eating too much dry and hard indigestible food, lack of dietary fiber in food, overeating, excessive dieting, cold abdomen, mental stress and other factors lead to gastrointestinal dysfunction, indigestion, increased secretion of digestive enzymes, such as salivary amylase, and sweetness in the mouth. Follow the doctor’s instructions to take gastrointestinal elimination tablets, domperidone, mosapride and other drugs to solve the best. Pay attention to the use of medication under the guidance of a physician.