Abstract
Evaluation of how effective particular caries preventive regimes are depends on the basic units of measurement used. In clinical trials, the DMF [decayed, missing or filled] index for [adolescent] teeth or surfaces were adopted. The same uniformity within the components that make up the indices is not so evident. The diagnostic criteria for clinical caries in current use, is considered. They are related to their discriminatory ability. Recommendations for use of individual criteria for particular surface types and severity levels are made. Recommendations are possible for initial and clinical caries severity levels on pit and fissure and free smooth surfaces. For anterior and posterior approximal surfaces no definitive conclusions could be reached.

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