Always have saliva and swallowing sweet is an abnormal phenomenon, can be seen in diabetes, oral hygiene, nerve conduction pathway abnormalities. 1. Endocrine disease: diabetic patients with poor blood glucose control, especially after eating sweeter food, blood sugar rises, the sugar content of saliva will also rise, you will feel more sweet water. 2. Oral disease: when brushing teeth is not in place to pay more attention to oral hygiene, oral memory to retain food debris, stimulate the secretion of amylase in saliva to increase the decomposition of food debris will produce sugar, resulting in increased saliva and sweet. 3. Abnormal nerve conduction pathway: the taste of the tongue is mainly transmitted through the facial nerve and the glossopharyngeal nerve, and then enters the brainstem and reaches the taste area of the insula, when the insula and related nerves of the brain are damaged, abnormal taste can occur. If you feel that your saliva is increasing and sweet, it is recommended that you go to the relevant department to find out the cause, so as not to leave any problems that may cause harm to your body.