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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.
Causes of Dry mouth (Dry mouth and tongue). The list of medical condition causes of Dry mouth (Dry mouth and tongue) includes: 1  Some simple reasons for dry mouth include: 2  Stuffy nose. 3  Mouth breathing (see Breathing symptoms). 4  Inadequate fluid intake. 5  Dehydration-see causes of dehydration.