For an adult with moderate to high caries risk, the radiographic interval is best described as:

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Radiographic surveillance should be tailored to the patient’s caries risk and how quickly lesions are likely to progress. In adults with moderate to high caries risk, the goal is to detect new or advancing interproximal decay early enough to intervene, while avoiding unnecessary radiation exposure. A window of roughly six to eighteen months provides a practical balance: it is frequent enough to catch changes in high-risk patients, yet not so frequent as to be unwarranted for every visit.

If a patient has active lesions, new restorations, or ongoing high-risk factors, imaging closer to six months may be warranted. If risk factors are present but disease appears stable, closer to eighteen months is reasonable. Longer intervals, such as twelve to twenty-four months or twenty-four to thirty-six months, would generally be less appropriate for moderate to high risk, since they may miss progressing lesions.