- Gel fluor 1, 23% effectiveness on the permanent tooth decay and the 6th tooth decay lession recovery at the early stage (D1, D2): + Gel fluor 1, 23% includes effect on remineralization, prevention and neutralization of the early permanent tooth decay lesions at D1, D2 levels: Gel fluor 1, 23% reduces 78, 6% of the early permanent tooth decay (D1, D2) after 18 months; The undecayed permanent tooth at D1 level rate of Gel fluor 1, 23% tooth brushed group is 0, 891 time lower (95% CI: 0, 440 - 1, 523) than in the childs P / S tooth brushed group after 18 months.