Dry mouth syndrome is usually linked to a lot of viral infections, autoimmune disorders and now also COVID-19.
Experiencing a dry mouth essentially means that your mouth is going through a difficult period of saliva production, which keeps your mouth greasy, aids digestion, and most importantly, keeps your mouth protected from bad bacteria and other pathogens. A dry mouth can make you feel dry or sticky in your mouth and, moreover, can make your saliva a little thicker.
Bad breath is also sometimes a common sign of dry mouth. It can also cause difficulty chewing food, speech and can cause you to experience a burning sensation in the mouth. Unusual symptoms like these, right now, should be checked immediately.