Do you wake up in the middle of the night and need to drink water? Or notice that your mouth constantly feels like it’s filled with cotton balls? You might have dry mouth (a.k.a. xerostomia), an oral health condition that causes reduced saliva flow, leading to symptoms like a burning sensation, rapid tooth decay, uncontrolled cavities, bad breath, altered taste and more. Dry mouth is quite common — it affects about one in five people, according to the Cleveland Clinic . But it’s under-diagnosed