There are many causes of dry mouth. Dry mouth most commonly occurs as a side effect of medications that cause decreased saliva production, including high blood pressure medications, antihistamines, antidepressants, diuretics, nonsteroidal anti-inflammatories, narcotics, and many others.
Liquid diet: The Liquid diet is the restriction of solid food intake, and replacement of solid food with liquids. In hospitals, liquid diets are prescribed by doctors for a number of reasons for patients who are unable to consume solid foods. Liquid diets may be prescribed following surgery or as a preparation for certain medical procedures.
Full Liquid Diet. A full liquid diet includes only liquids and foods that are liquid at room temperature. You may need to follow this diet if you have trouble chewing or swallowing. You may also need to follow this diet if you have a severe intestine illness or had surgery on you intestine.