<prompt> Which of the following classification of caries is based on the healing capacity of enamel and dentin?GV BlackBaumFinn modification of Black classificationMount and Hume  <response>: It defines the site, extent and complexity of a cavity and stresses on conservative approach. Denoted by 2 numbers, first for site and second for extent. Determines the healing capacity of enamel. It is the basis of minimal intervention dentistry.Site 1 pits and fissures on posterior occlusal surfaces or smooth surfaces.Site 2 contact areasSite 3 cervical third of crown after recession and root surfaceSize 1 minimal dentinal involvement just beyond treatment by remineralization aloneSize 2 moderate involvement of dentin following cavity preparation but enamel is sound and well supported.Size 3 large cavity with weakened structure, may fail under load. Restoration designed to support toothSize 4 extensive caries with bulk loss of tooth structure.TB of Operative Dentistry by Vimal Sikri 1 st ed., 130 