It can be due to conditions that lead to dehydration, such as fever, excessive sweating, vomiting, diarrhoea, blood loss, and burns can cause
dry mouth.
Dry mouth can be due to medical conditions like diabetes, thyroid problems, anaemia, cystic fibrosis.
Certain measures will help like- Drinking plenty of water to help keep your mouth moist. Sucking on sugar-free candy or chewing sugar-free gum. You can also use an over-the-counter artificial saliva substitute.