Xerostomia is the medical name given to dry mouth due to little or no saliva secretion.⠀ ⠀ Dry mouth is an excessive decrease in saliva that can occur as a side effect of a serious illness or some medications. Mouth breathing, dehydration, disease involving the salivary glands such as Sjögren’s syndrome (SS), an injury to the head and neck region, radiotherapy and chemotherapy of the head and neck region are effective in the salivary glands’ production and secretion of saliva.