Xerostomia can be caused by radiation therapy.

• A. True
• B. False
• C. Only after chemotherapy
• D. Not known to cause

Answer: (A)

Xerostomia is a dry mouth that happens when salivary flow is reduced. Radiation therapy to the head and neck often damages the salivary glands, especially the parotid and submandibular glands, leading to decreased saliva production. This effect can start during treatment and may persist long after therapy, depending on the radiation dose and which glands are affected. The resulting dryness can cause trouble with swallowing, speaking, taste, and increases the risk of dental decay and infections, making oral care and saliva management important during and after treatment. While chemotherapy can also cause dry mouth, radiation therapy can directly produce xerostomia, so the statement is true.