Use of dental radiographs is a common diagnostic procedure in dentistry, and it's purpose is to find hidden dental structures, malignant or benign masses, bone loss, and cavities. They have a minimum amount of radiation and it's very safe. They are diagnostic, but they can also be preventative, by helping a dentist diagnose potential oral care issues in a patient’s mouth before they become a major problem. An x-ray is a type of energy that passes through soft tissues and is absorbed by dense tissue. Teeth and bone are very dense, so they absorb X-rays, while X-rays pass more easily through gums and cheeks.