The results of our investigation were as follows: the lower second molars had the highest percentage of caries followed by the upper central incisors in the deci-duous teeth.

• 其结果如下：在每个年龄层，龋齿在上颚比下颚多，而下颚孚牙第二大臼齿龋率最高，其次是上颚孚牙中切齿。