Saliva is dynamic secretion that maintains the oral health by its several chemical and physical properties. At all the times, throughout day and night saliva is fit into its function either during resting or active state. Its importance on oral and systemic health is recognized only during xerostomia conditions. Either defects in the chemical composition or the salivary flow rate, the deficiency in the salivary characters is reflected on the oral and systemic health of the individual. Saliva was given a little importance in the research field till the recent past wherein lot much has been learnt through various research studies on saliva in several local and systemic conditions. Even though saliva could be considered as a supplementary fluid in the diagnosis of several diseases, but the importance of the same can not be neglected.