In this research, caries severity was used as the dependent variable. The dmft/DMFT was calcu-lated as sum of total decayed (d/D), missing (m/M) and filled (f/F) teeth for primary and permanent teeth. Then the children were catego-rized into three groups on the basis of WHO ca-ries severity classification (2). Low caries level was defined as dmft/DMFT≤2.6, moderate caries level as dmft/DMFT of 2.7-4.4 and high caries level as dmft/DMFT>4.4.