Sweet mouth can be caused by elevated blood sugar, dietary factors, and other disease factors. In diabetes, elevated blood sugar in the body may lead to an increase in the sugar content in the saliva, and the symptoms of a sweet mouth may occur. Therefore, sweet mouth may be caused by elevated blood sugar. In addition, after eating sugary food, sugar residue in the mouth may also appear sweet mouth symptoms; digestive dysfunction leads to indigestion when the saliva in the mouth amylase secretion increases may also lead to sweet mouth performance. When sweet mouth occurs, it is recommended to exclude dietary factors and go to the hospital to consult a doctor to determine the cause of the problem.