Effectiveness of DMFS index changing 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 D1S 1.5 ± 2.6 0.8 ± 1.7 46.7 1.2 ± 1.8 1.1 ± 2.4 8.3 38.3 D2S 1.0 ± 1.6 0.4 ± 1.1 60.0 0.6 ± 1.3 1.6 ± 2.4 166.7 * 226.7 D3S 0.2 ± 0.7 0.7 ± 1.4 250.0 * 0.2 ± 0.6 1.4 ± 2.4 600.0 * 350.0 DS 2.7 ± 2.9 1.9 ± 2.6 29.6 1.9 ± 2.4 4.0 ± 4.3 110.5 * 140.2 DMFS 2.7 ± 2.9 2.1 ± 2.7 22.2 1.9 ± 2.5 4.0 ± 4.2 110.5 * 132.7 p (Prtest) <0.001; (*): Effective index decreases After 18 months, DMFS index of the control group strongly increases from 1.9 up to 4.0, corresponding to a decrease of 110.5% in effective index.