Frequent dry mouth may be caused by bad habits, salivary gland diseases, oral mucosal diseases, systemic diseases, etc. It is recommended to go to the hospital for examination and treatment. 1. Frequent smoking, betel nut chewing, eating spicy and irritating food, alcoholism or staying up late may cause frequent dry mouth, and it is recommended to correct the bad habits. 2. Mumps, submandibulitis, sublingual gland inflammation or salivary gland tumors may affect salivary secretion and cause dry mouth. 3. Oral mucosal diseases such as oral leukoplakia, candida infection or lichen planus may cause dry mouth. 4. Systemic diseases, such as dry syndrome, diabetes mellitus, uremia or menopausal syndrome, can also cause dry mouth, and it is recommended to actively treat the primary disease.