what are the causes of a dry mouth all the time
1 Dry mouth can be a result of nerve damage to the head and neck area from an injury or surgery. 2  Dehydration. 3  Conditions that lead to dehydration, such as fever, excessive sweating, vomiting, diarrhea, blood loss, and burns can cause dry mouth. 4  Surgical removal of the salivary glands. 5  Lifestyle.ommon symptoms include: 1  A sticky, dry feeling in the mouth. 2  Frequent thirst. 3  Sores in the mouth; sores or split skin at the corners of the mouth; cracked lips. 4  A dry feeling in the throat. 5  A burning or tingling sensation in the mouth and especially on the tongue.