In the intervention group, the index takes a slight increase from 2.3 pre-intervention to 2.5 after 6 months, then a decrease of 1.8 after 12 months, and 1.9 after 18 months. DMFS index remains after 6 months of intervention, then decreases from 2.7 down to 1.9 after 12 months, and 2.1 after 18 months.