METHODS:This study was a double blind, controlled clinical trial with a total of sixty volunteers from military academy. Who were divided into three groups at random,Heimei R xylitol group,Heimei R blank group and Colgate R total group.

• 方法: 60名军校学员随机分为3组,即黑妹木糖醇牙膏组、黑妹空白牙膏组、高露洁全效牙膏组,双盲法评价1周和4周后的刷牙效果。