If you're undergoing radiation therapy, your oral health may be the last thing on your mind. However, it may surprise you to learn that radiation can cause several side-effects inside your mouth, including radiation caries, a type of rampant tooth decay that occurs following treatment. Dental caries, also known as tooth decay, lead to cavities (deep caries). This decay can have serious effects on your oral health, but you can easily keep it under control with your dental professional's help. Here are four oral health questions you should have answered if you are undergoing radiation treatment.