Everyone suffers from a dry mouth from time to time, whether that is due to nerves or dehydration. But it should be temporary, and sipping water should help.
However, for some people, their dry mouth is more severe and doesn’t disappear, even with water! These people have a clinically dry mouth – sometimes referred to as xerostomia.
The most common cause of a clinically dry mouth is medication, and in particular, multiple medications.