Abstract: Objective To compare the cariespreventive effect between pit and fissure sealant and fluor protector on first permanent molars pit and fissure caries. Methods The first permanent molars of 300 children were treated respectively with light cured pit and fissure sealant (left side) and fluor protector (right side), and incidence of caries was examined respectively after 0.5, 1.0 and 2.0 years. Results No significant differences of incidence of caries were detected after 0.5, 1.0 and 2.0 years. Conclusion Both pit and fissure sealant and fluor protector have good clinical effect on preventing caries.

Key words: pit and fissure sealant, fluor protector, incidence of caries