设计:该试验是应用Zelen设计的随机对照试验。干预措施:试验组的妇女接收3轮各种预防性指导意见的印刷资料宣教。第一轮是纳入试验时给予,第二、第三轮均为在孩子6～12个月时邮寄至母亲的家庭地址。每一轮的宣教主题是有关母亲或孩子在接下来6个月的口腔发展特点。此外,在第一 Design: This test is a randomized, controlled trial designed using Zelen. Interventions: Women in the test group received three print material missions of various preventive directives. The first round is included in the trial, and the second and third rounds are all mailed to the mother’s home address from 6 to 12 months of age. The theme of each round of mission is about the oral development of mothers or children over the next six months. In addition, at first