７５名大学生作为试验对象，平时有饮茶习惯者３４名为饮茶组，平时从不饮茶者４１名为不饮茶组。饮茶组在试验开始前１周即停止饮茶，试验开始后按照中国人传统饮茶方式饮茶３周，其中２１人饮用选定的高氟茶，１３人饮用低氟茶，取样前停止喝茶１小时以上，试验期间要求... Seventy-five college students were the subjects of the experiment. There were 34 tea drinkers who used to drink tea, and 41 tea drinkers did not drink tea at any time. The tea drinking group stopped drinking tea one week before the start of the trial. After the trial started, the tea was consumed according to Chinese traditional tea drinking methods for 3 weeks. Among them, 21 were drinking selected high-fluorine tea and 13 were drinking low-fluorine tea, and the samples were stopped before sampling. Drink tea for more than 1 hour, request during the trial...