Abstract: Untreated dental caries and its clinical consequences has become a public health problem notably polarized to socio-economically deprived children in many countries thus demonstrating social inequality. However, severity of untreated dental caries according to clinical consequences was rarely reported in literature in the past, until development of PUFA/pufa index by Mons et al., 2010. The dmft/DMFT indices of basic methods of World Health Organization (WHO) have become the choice for all national oral health surveys and epidemiological surveys conducted across the globe. Nevertheless, those indices of caries status provide limited information about the severity of advanced carious lesions.