X-rays, also known as radiographs, are commonly used in dental exams of patients of all ages. Panoramic x-rays, which are taken every five to seven years and show the entire mouth, are particularly useful diagnostic tools. Panoramic x-rays are taken with a machine that circles your head providing a complete overview of all the teeth as well as the roots, upper and lower jawbones, the sinuses, and other hard surfaces in the mouth. Many problems with teeth and the surrounding tissues cannot be seen when we visually examine your mouth. An x-ray examination is needed to reveal: