Xerostomia - insufficient salivation, accompanied by increased dryness of the oral mucosa. If you feel dryness in the mouth and throat, burning of tongue, difficulty when chewing, swallowing, and speaking, violation of taste perception or metallic flavor in the mouth these are signs of xerostomia. The most common causes are side effect of come medicine or manifestation of the underlying disease (diabetes, Parkinson's disease, HIV). Oral Surgeons in South Carolina will discover not only its reason but provide all necessary treatment. The most common way of treatment is injection that increases salivation. Surgeons may also prescribe special diet.