All the students had their teeth X-rayed at the end of the first and second years.
所有的学生都在一年级和二年级结束时做了牙齿 X 光检查。
2
The last teeth to appear (the second molars, found in the very back of the mouth on the top and bottom) have usually begun coming into place by your baby's second birthday.
到宝宝两岁时，最后的几颗牙齿（臼齿，就是位于口腔后方两侧的牙齿）就都开始各就各位了。
3
Coming second in the survey is the myth that when your milk teeth fall out, if you put them under your pillow, the tooth fairy will replace them with sixpences.