Saliva plays a critical role in the preservation of or pharyngeal health. Complaints of a dry mouth (xerostomia) and diminished salivary output are common in older populations, which can result in impaired food and beverage intake, host defense and communication. Persistent xerostomia and salivary dysfunction can produce significant and permanent oral and pharyngeal disorders and can impair a person's quality of life. Saliva is an essential part of a healthy mouth that is often taken for granted. The lubricating properties of saliva provide comfort and help protect the oral tissues against ulcers, sores, and other effects of friction. Saliva neutralizes acids and provides antibodies against bacterial threat. Saliva helps digest food and helps teeth in the remineralization process. Saliva is also a very essential contributor to a person's ability to taste, as it acts as a solvent for the taste stimuli.

Xerostomia information for dentists By Cathy L. Bartels, Pharm.D., assistant professor, pharmacy practice, School of Pharmacy and Allied Health Sciences, University of Montana.