Dry mouth is referred to as Xerostomia. It occurs due to decreased salivary flow

into the oral cavity. It has a significant effect on the quality of patient’s life, affecting dietary habits, nutritional status, speech, taste, decreased tolerance to dental prosthesis and increased susceptibility to dental caries. Ageing causes significant changes in the morphology and function of salivary glands. Saliva plays a paramount role in lubrication, defense and protection role in the oral cavity. Difficulty in speech articulation, dry mouth, increased prevalence of infections, and alteration in taste perception occurs. The secretory capacity of salivary gland decreases as age increases. Salivary gland morphology is altered with replacement of functional acinar elements with fat and fibro vascular tissue. This article deals with overall review about xerostomia. The insights of the article will help the clinicians to have sound understanding of this condition, prompt diagnosis and monitoring of xerostomia patients in order to ensure proper treatment for these patients.