Most water systems in the U.S. have fluoride added to help protect residents' teeth. Some research raises concerns that, at high enough levels, fluoride may be linked to lower IQs in kids. Justin Sullivan/Getty Images hide caption
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Adding fluoride to the U.S. drinking water has long been considered one of greatest public health achievements of the 20th century. Still, debate continues about its worth. Catherine Falls Commercial/Getty Images hide caption
Just this month, California declared a state of emergency due to rising cases of bird flu in dairy cattle. BeritK/Getty Images hide caption
From Ozempic to bird flu: Here are the biggest health stories of 2024
Florida's surgeon general, Joseph Ladapo, recommended Friday that local jurisdictions stop adding fluoride to drinking water. He is pictured here at a bill signing by Gov. Ron DeSantis on Nov. 18, 2021, in Brandon, Fla. The bill banned vaccine mandates for public sector employees and school districts. Chris O'Meara/AP hide caption
A town employee in Richmond, Vt., who quietly lowered the fluoride level in the drinking water has resigned. Wilson Ring/AP hide caption
A pickup rolls through downtown Richmond, Vt., on Wednesday. A town employee is under fire for lowering fluoride in the drinking water below the state's recommended level. Wilson Ring/AP hide caption
A study conducted in six Canadian cities found a link between maternal consumption of fluoride during pregnancy and intelligence of their offspring. vitapix/Getty Images hide caption
Can Maternal Fluoride Consumption During Pregnancy Lower Children's Intelligence?
No-Drill Dentistry: Fluoride Treatments Can Prevent Cavities In Adults
Feds Say It's Time To Cut Back On Fluoride In Drinking Water
Twenty percent of Americans think that cellphones cause cancer and that the government and big corporations are covering this up. iStockphoto hide caption
Demonstrator China Starshine holds up signs outside of City Hall in Portland last week. Ross William Hamilton/The Oregonian/AP hide caption