Most get braces when they are in middle school or high school, and keep them on for a year or more.
很多人在初中或高中时便已开始戴牙套，并且要戴一年或者多年。
Although most children don't get braces until about age 12, in certain cases pediatric dentists recommend an earlier use of them to correct structural problems in the teeth or jaws.
尽管多数孩子12岁之前不需要戴牙箍，然而某些情况下儿科牙医确实会建议早些使用牙箍以矫正牙齿和腭部出现结构问题。
Although most children don't get braces until about age 12, in certain cases pediatric dentists recommend an earlier use of them to correct structural problems in the teeth or jaws.
尽管多数孩子12岁之前不需要戴牙箍，然而某些情况下儿科牙医确实会建议早些使用牙箍以矫正牙齿和腭部出现结构问题。
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