What is a common effect of radiation on teeth during treatment of head and neck cancers?

A common effect of radiation on teeth during the treatment of head and neck cancers is the development of caries (cavities). Radiation therapy can lead to dry mouth, or xerostomia, due to damage to the salivary glands. Saliva plays a critical role in protecting teeth against decay by neutralizing acids and washing away food particles and bacteria. When saliva production is reduced, the risk of developing dental caries increases significantly.

Additionally, patients undergoing radiation treatment may struggle with maintaining oral hygiene, as they might experience discomfort and sensitivity in their mouths, further compounding the likelihood of tooth decay. Therefore, the correct answer highlights a well-documented consequence of radiation therapy that is linked to the changes in oral environment and health during cancer treatment.