Dry mouth and tastelessness may be produced by insufficient drinking water, the influence of dietary habits, or may be caused by some underlying diseases. 1. Insufficient drinking water: if it is a long time without drinking water, in the case of extreme dehydration of the body, there will be dry mouth performance. 2. Dietary habits: mainly people who are more partial to food may cause a lack of vitamins, iron and zinc and other trace elements in the body, and may also have a decreased sense of taste and a bland and tasteless mouth. 3. Underlying diseases: If you suffer from diabetes, anemia and other underlying body diseases, some patients in the clinic will have a dry mouth, loss of appetite, which will feel dry mouth tasteless. It is recommended that patients with obvious symptoms promptly go to the hospital for further examination and improvement under the guidance of the doctor.