According to the American Dental Association, over one third of cancer patients report complications affecting their mouths. The adverse effects are usually due to chemotherapy and radiation treatments used to treat cancer. The most common side effects patients report are dry mouth, sensitive gums, mouth sores, and jaw pain. Chemotherapy can weaken the immune system, making oral infections more common in patients who are undergoing chemotherapy treatments. Radiation treatments to the mouth or neck can damage salivary glands, which can lead to dry mouth. Not only is extreme dry mouth uncomfortable, but it can lead to tooth decay and infection. If you are undergoing cancer treatment, make sure to speak with your dentist about any complications.