Dental caries rate changing effectiveness by each level of the two groups after 18 months of intervention Groups Dental caries The intervention The control InI Pre - intervention After 18 months EI Pre - intervention After 18 months EI n% n% n% n% D1 87 44, 2 56 28, 7 35, 1 104 42, 1 83 33, 6 20, 2 14, 9 D2 73 37, 1 38 19, 5 47, 4 54 21, 9 133 53, 9 146, 1 * 193, 6 D3 18 9, 1 49 25, 1 175, 8 * 19 7, 7 108 43, 7 467, 5 * 291, 7 D1, 2 128 65, 0 76 39, 0 40, 0 121 49, 0 175 70, 9 44, 7 * 84, 7 D1, 2, 3 133 67, 5 106 53, 8 20, 3 124 50, 2 199 80, 6 60, 6 * 80, 9 p (Prtest) <0.001; (*): Effective index decreases After 18 months of intervention, in the control group, dental caries rate increases from 50.2% up to 80.6%, indicating a decrease of 60.6% in effective index; in which incipient caries rate (level D1 and D2) increase from 49.0% up to 70.9%, the effective index also decreases 44.7%.