What happened when Calgary removed fluoride from its water supply
6:00
YouTubePBS NewsHour
What happened when Calgary removed fluoride from its water supply
Earlier this month, Health and Human Services Secretary Robert F. Kennedy Jr. announced plans to end the federal recommendation that municipalities add fluoride to their drinking water. Amid the renewed debate, William Brangham spoke with Lindsay McLaren of the University of Calgary to discuss why that community removed fluoride from its water ...
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含氟牙膏使用方法
【校本课程-自剪视频】02含氟牙膏的作用、如何正确刷牙
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