... disease, dehy-dration), medications (both prescription and non-prescription), head and neck irradiation and chemotherapy can cause or contribute to salivarygland diseases.1-3,5Furthermore, evidence ... dysfunction (Box).SS. SS is one of the most frequently encoun-tered chronic autoimmune connective-tissue dis-orders, and it is the most common systemic condi-tion associated with xerostomia and ... most common cause of sali-vary disorders is the use of prescription and non-prescription medications. For example, Sreebny and Schwartz8reported that 80 percent of the most commonly prescribed...