The causes of dryness in the upper jaw of the mouth usually include frequent breathing through the mouth, oral diseases, immune system diseases or high blood sugar, etc., which need to be treated by a doctor as soon as they are detected. Due to allergic rhinitis, adenoid hypertrophy, nasal tumors, obesity and other factors can lead to frequent breathing through the mouth, which in the long run will cause a reduction of saliva in the mouth and dryness of the palate; secondly, oral diseases, such as stones in the oral glands, mumps or submandibular inflammation, can also lead to abnormal secretion of oral glands and reduced saliva secretion, causing dryness of the palate. In addition, immune system diseases can also violate the salivary glands and lacrimal glands, such as dry syndrome usually manifested as dry mouth, dry eyes, etc.; and when the blood sugar increases, due to the body’s water through the urinary system a large number of discharges, which results in the loss of water in the body self-consciousness of the upper jaw dryness.