Investigate the zinc nutrition state in 2-6 year-old children of Jiyang county. Find out the reason for the lack of zinc and explore the effective way to apply zinc to children.
了解济阳县2 ~ 6岁儿童锌营养状况，寻找缺锌原因，探索补充儿童锌营养的有效途径。
Methods 612 children aged 6~7-year-old from 2 schools were assigned to a fluoride foam group, a fluoride gel and a control group.
方法将武汉市两所小学612名6～ 7岁儿童分为氟化泡沫组、氟化凝胶组和对照组，每6个月分别使用一次氟化泡沫和氟化凝胶，为期2年。
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