What is a full-mouth series (FMS)?

• A. 10-12 total radiographs
• B. 24 total radiographs
• C. 6-8 total radiographs
• D. 18-20 total radiographs

Answer: (D)

A full-mouth series is a complete set of intraoral radiographs that documents the entire dentition and the supporting structures. In practice, this usually means about 18 to 20 images, combining periapical views of all teeth (to evaluate the tooth roots and surrounding bone) with bitewing views (to assess interproximal surfaces and crestal bone height). This mix provides a comprehensive baseline so clinicians can diagnose caries, monitor bone levels, and detect periapical pathology across the entire mouth. That’s why the typical total is 18–20 radiographs. Fewer radiographs (like those in the very small ranges) wouldn’t capture all teeth, while a much larger total (like 24) exceeds the standard set used for a full-mouth survey.