O'Leary Plaque Index: percentage of Surfaces w/ plaque present, divided by Total number of surfaces present
Caries risk assessment form
DMFS (Decayed, Missing, Filled, Surfaces): there are 5 surfaces on posterior teeth, and 4 surfaces on anterior teeth (doesn't count incisal). D includes carious or restored, M is extracted, F is caries filled or defectively filled for caries but not decayed. The total count is 128 (not inc 8's) or 148 surfaces (inc 8's)
ICDAS (International Caries Detection and Assessment System):