Review: xerostomia: a symptom which acts like a disease.

This review considers the changes in salivary glands associated with ageing and concludes that there is no evidence to show that xerostomia is likely to result from the ageing process alone. The four main factors causing xerostomia are presented and it can be seen that the condition is a side-effect of diseases and the drugs used to treat these diseases. As xerostomia has a significant effect on a person's quality of life, a multifaceted approach to treating xerostomia is presented. All health care workers should be sensitive to those complaining of dry mouth and help them to seek care.