The result of investigation of different age groups indicated that there is a negative correlation between DMFT and the fluorine concentrations in drinking water.
结果显示，在安全的饮水氟浓度范围内，龋均与饮用水氟浓度之间存在负相关关系，表明适度饮水氟化可以有效降低龋均；
The result of investigation of different age groups indicated that there is a negative correlation between DMFT and the fluorine concentrations in drinking water.
结果显示，在安全的饮水氟浓度范围内，龋均与饮用水氟浓度之间存在负相关关系，表明适度饮水氟化可以有效降低龋均；
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