The number of dental scans recommended for an average adult per year depends on whether the patient has periodontal disease and is a new or returning patient, according to the U.S. Food and Drug Administration. Patients at increased risk for dental caries may need more dental scans.
New patients with permanent dentition should have a full-mouth exam upon the first visit to the dentist, notes the FDA. Posterior bitewings should be taken at 6- to 18-month intervals for patients at risk for dental caries, or every 24 to 36 months if not at risk for caries. The FDA advises dentists to use their own clinical judgement about the need for radiographic dental scans when treating patients with periodontal disease.