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Other diseases which cause dry mouth, not only during the night but during the day as well â these are viral and bacterial infections and Sjogrenâs syndrome, all of which have an influence on the flow of saliva. Other problems that affect the saliva flow include: 1  Bellâs palsy. 2  Tumors. 3  Salivary gland stones. 4  Depression.
Dry mouth is one of the causes of gum disease, a dangerous oral health problem that can create health issues throughout your body including stroke, heart disease, and heart attacks. In children, breathing from the mouth may lead to poor sleep, lower oxygen concentration in the blood, and facial deformities.