Is water fluoridation good or bad? Dr F. Perry Wilson explains why a recent study fails to answer this question.
, your weekly dose of commentary on a new medical study. I'm Dr F. Perry Wilson of the Yale School of Medicine.
But fluoridation has never been without its detractors. One problem is that the spectrum of beliefs about the potential harm of fluoridation is huge. On one end, you have science-based concerns such as the recognition that excessive fluoride intake can cause fluorosis and stain tooth enamel. I'll note that the EPA regulates fluoride levels — there is a fair amount of naturally occurring fluoride in water tables around the world — to prevent this.
The main thing you'll hear about this study — in headlines, Facebook posts, and manifestos locked in drawers somewhere — is the primary result: A 0.68 mg/L increase in urinary fluoride in the mothers, about 25 percentile points, was associated with a doubling of the risk for neurobehavioral problems in their kids when they were 3 years old.But this is not a randomized trial.
But I have a deeper issue with this study than the old"failure to adjust for relevant confounders" thing, as important as that is.
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