Which statement best describes the location of recurrent caries?

• A. On the occlusal surface away from restorations
• B. Beneath or adjacent to a restoration
• C. On the root surface near gingiva
• D. In between teeth in contact area

Answer: (B)

Recurrent caries occur at the site of a previous restoration, most commonly just beneath or at the margins where the tooth and restoration meet. B describes this location because bacteria can infiltrate through a compromised seal or marginal gap and progress under or right beside the restoration, even though the restoration remains in place. This distinguishes recurrent caries from decay that develops on a sound tooth surface away from any restoration, decay that occurs on root surfaces near the gums, or decay that forms in the contact area between natural teeth. Keeping margins well-sealed and intact helps prevent recurrent caries, since the interface between tooth and restoration is where these lesions typically begin.