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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.
Most times, dry mouth is due to something simple, like dehydration or weather. However, if youâre constantly plagued with dry mouth regardless of the season and how much fluids you drink, it could be a sign of a more serious conditionâsuch as Crohnâs or another autoimmune disease. Here are the seven most common causes of that dry, pasty mouthâ¦.