DefinitionDental x-rays are a type of picture of the teeth and mouth. X-rays are a form of electromagnetic radiation, just like visible light. They are of higher energy, however, and can penetrate the body to form an image on film.Structures that are dense (such as silver fillings or metal restoration) will block most of the photons and will appear white on developed film. Structures containing air will be black on film, and teeth, tissue, and fluid will appear as shades of gray.Alternative NamesX-ray - teeth; Radiograph - dental; Bitewings; Periapical film; Panoramic filmHow the test is performedThe test is performed in the dentist's office. There are four types of x-rays:BitewingPeriapicalPalatal (also called occlusal)PanoramicThe bitewing is when the patient bites on a paper tab and sho