State lawmakers skeptical of federal guidance on fluoride in water are proposing limits or bans on community fluoridation, a decades-long practice credited with reductions in dental decay across the country. Lawmakers in four states have introduced legislation that would outlaw adding fluoride to community water systems, and four other states are considering bills to make fluoride optional or limit its concentration. Only one, Utah’s, has moved past its original chamber. The anti-fluoridation legislation comes after President Donald Trump tapped Robert F. Kennedy Jr., a water fluoridation skeptic, to lead the US Department of Health and Human Services. Kennedy was confirmed this week.

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• University of Colorado, Anschutz Medical Campus: Blog: Fluoride and public health: Filling in the blanks