Xerostomia. While you try to pronounce that we’ll tell you a little bit about this condition that plagues many people. The street name for this disease is “dry mouth” (much less scary sounding, right?) and it’s symptoms include a persistently dry feeling mouth. Dry mouth is caused by a variety of external stimuli such as smoking, alcohol or drug use, or dehydrations, but can also be a symptom or side effect of diseases, treatments and medications.