The differences in caries presentations and behavior in different anatomical sites in children make it unlikely that any one diagnostic modality will have adequate sensitivity and specificity of detection of carious lesions for all sites. A combination of diagnostic tools helps us diagnose lesions earlier and detect failing restorations sooner, all to avoid more costly, destructive dental procedures and truly take dentistry into the preventive rather than the reactive mode. This book enumerates all the caries diagnosis methods used in pediatric patients from past through future in an elaborate method.