This document discusses the limitations of caries detection dye (CDD) for diagnosing dental caries. It provides an example of a case where CDD provided an inconclusive result for a caries developing within the depths of a fissure, between nearly closed enamel walls. The document emphasizes that accurate caries diagnosis requires consistent use of magnification, an in-depth understanding of the caries process, and utilization of multiple modern diagnostic tools, as caries can develop in varied ways within the same mouth. It encourages the use of additional diagnostic methods like the DIAGNOdent when CDD results are inconclusive.