Salty mouth may be caused by poor oral hygiene, oral diseases, etc.; sweetness may be indigestion, diabetes and other reasons. 1. Salty mouth: if usually poor oral hygiene, do not love brushing, there will be more food debris accumulation and produce a salty taste; if there are dental caries, gingivitis, wisdom teeth, pericoronitis, abscesses and other oral diseases will also appear salty mouth. Need to develop good oral hygiene, regular checkups, if there are diseases should be timely medical treatment with medication, such as metronidazole, chlorhexidine mouthwash. 2. Sweet mouth: If there is indigestion can lead to abnormal salivary secretion, there will be salivary amylase will be too much food decomposition to generate glucose, thus appearing sweet mouth; if you suffer from diabetes, personal blood sugar level is higher, there will be the phenomenon of sweet mouth. It is recommended to follow the doctor’s advice to use drugs to promote digestion, such as domperidone, etc., and diabetic patients should use insulin and other hypoglycemic drugs. Patients are advised to go to the stomatology department and the endocrinology department for examination and treatment in a timely manner, to avoid blind use of medication, and to develop good oral hygiene habits.