Dry mouth is a condition that makes you feel like you do not have enough saliva. Excessive dry mouth can lead to serious problems and should be treated. According to the National Institute of Dental and Craniofacial Research, symptoms include a dry feeling inside the mouth, difficulty chewing, tasting or talking, a dry tongue or throat, cracked lips, mouth sores and a burning feeling inside the mouth. It happens when the salivary glands are not producing enough saliva, which, in turn, can cause problems with tooth decay, food digestion and swallowing, as well as mouth infections. Dry mouth is often caused by medication side effects, diseases such as HIV/AIDs, diabetes and Parkinson’s, cancer treatments and nerve damage, according to the Institute.