US updates water fluoridation guideline for the first time in 53 years
from The Washington Post
More than 50 years after issuing its previous guideline, the government on Monday recommended that drinking water contain .7 milligrams of fluoride per liter. It was the first change in the recommendation since the previous level — a range of .7 to 1.2 milligrams per liter — was set in 1962.
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