DMFT index changing effectiveness of the two groups after 18 months of intervention Groups Index The intervention The control InI Pre - intervention After 18 months EI Pre - intervention After 18 months EI Mean ± SD Mean ± SD D1T 1.2 ± 1.8 0.7 ± 1.6 41.7 1.2 ± 1.7 0.9 ± 1.6 25.0 16.7 D2T 0.9 ± 1.4 0.4 ± 0.9 55.6 0.5 ± 1.2 1.3 ± 1.6 160.0 * 215.6 D3T 0.2 ± 0.6 0.6 ± 1.3 200.0 * 0.1 ± 0.5 1.2 ± 1.7 1100.0 * 900.0 DT 2.3 ± 2.2 1.7 ± 2.4 26.1 1.8 ± 2.2 3.3 ± 2.7 83.3 * 109.4 DMFT 2.3 ± 2.2 1.9 ± 2.5 17.4 1.8 ± 2.2 3.4 ± 2.6 88.9 * 106.3 p (Prtest) <0.001; (*): Effective index decreases After 18 months of intervention, in the control group DMFT index increase from 1.8 up to 3.4, corresponding to a decrease of 88.9% in effective index.