Book excerpt: Xerostomia, more commonly called dry mouth, affects an estimated 20 percent of adults worldwide and can severely diminish one’s quality of life. Dry Mouth, the Malevolent Symptom: A Clinical Guide relies on evidence-based research to provide an introductory primer on oral dryness and the modalities available to treat it. The book describes the varied etiology of the disease, but emphasizes clinical protocols and step-by-step procedures for diagnosis and treatment planning. Dry Mouth is a user-friendly manual guiding clinicians through identifying and managing this common condition. Causes including radiotherapy, chemotherapy, systemic diseases, polypharmacy, and the natural progression of aging are discussed in conjunction with the clinical symptoms and signs associated with each one. Multiple avenues for treatment are presented, highlighting salivary stimulation and supplementation techniques, pharmacologic aids, and critically required oral therapy. Although intended primarily for the professionals that treat those affected by xerostomia, Dry Mouth may also be of interest to sufferers of this condition.