Dry mouth and less saliva should be alert to the emergence of dry syndrome, oral mucosal lesions and other diseases. 1. Dry syndrome: it is a chronic inflammatory autoimmune disease mainly characterized by decreased secretion of lacrimal and salivary glands, which may be related to infection, heredity, endocrine and other factors. Clinical symptoms include dry mouth, low saliva, abnormal taste, etc. Therefore, dry mouth and low saliva may occur. 2. Oral mucosal lesions: due to long-term poor oral hygiene, long-term smoking and other factors that can easily trigger oral bacterial infection, resulting in lesions of the local oral mucosa. Clinical symptoms include dry mouth and loss of water in the oral cavity, which may lead to dry mouth and low saliva. When the situation of dry mouth and low saliva occurs, you should consult a doctor in time to find out the cause, and carry out targeted treatment under the guidance of the doctor, so as not to delay the condition.