Chemotherapy and radiation therapy can inflict mouth sores and affect the salivary glands and the health of teeth and gums. Cavities, broken or chipped teeth, improperly installed crowns or fillings, and gum disease can worsen during cancer treatment. During treatment, since the white blood cell counts are reduced, the immune system fails to function at its full potential, causing mouth infections. There are a few best oral care hygiene practices for individuals undergoing or may have undergone cancer treatment