We breathe radioactive radon in the atmosphere. We're exposed to cosmic radiation from space and terrestrial radiation from radioactive isotopes in stone and building materials. In addition to natural radiation we get radiation from tobacco smoke, watches with luminous dials, color television sets and computer screens. A complete dental exam gives about one and half day's worth of radiation exposure. This creates an image on the radiograph.
Teeth appear lighter because fewer X-rays penetrate to reach the film.
Cavities and gum disease appear darker because of more X-ray penetration. The interpretation of these X-rays allows the dentist to safely and accurately detect hidden abnormalities. Very high definition details of the individual teeth. Bitewing - Taken to view back teeth. A bitewing series is used to update a recent full series on a regular schedule that is appropriate for each patient.