Which condition is characterized by diminished saliva output leading to xerostomia and caries?

• A. Sjogren's syndrome
• B. Rheumatoid arthritis
• C. Stomatitis
• D. Dental erosion

Answer: (A)

Diminished saliva output leading to xerostomia and caries is most characteristic of Sjögren's syndrome, an autoimmune condition in which the salivary glands are attacked and their function is impaired. When saliva production drops, the mouth loses its natural cleansing action and buffering capacity. Saliva normally helps neutralize acids produced by bacteria, supplies minerals like calcium and phosphate for enamel remineralization, and washes away food particles. Without enough saliva, the oral environment becomes more acidic and harder to remineralize, so dental caries develop more readily. Sjögren's is often accompanied by dry eyes and can occur alone or with other autoimmune diseases.

Rheumatoid arthritis is primarily a joint disease and, while it can occur with Sjögren's, it does not by itself explain reduced saliva or xerostomia. Stomatitis is tongue or mouth inflammation and does not inherently describe decreased salivary flow. Dental erosion refers to enamel loss from acid exposure, not specifically from reduced saliva production.