The pit and fissure sealant have significant preventive effect on cariousteeth.
窝沟封闭能有效预防窝沟龋的发生。
2
Conclusion: the pit and fissure sealant have significant preventive effect on cariousteeth.
结论：窝沟封闭能有效预防窝沟龋的发生。
3
Because this study choosed the children who had at least two cariousteeth at the same time that avoided bias on different oral circumstance, different oral habit, and different dietetic habit.