Calgary removed fluoride from its water supply in 2011, but residents voted to reverse course after studies linked the move ...

Citing "evolving scientific research," Gov. Kevin Stitt is ending Oklahoma's endorsement of fluoride in drinking water.

What is fluoride? What are its benefits? Fluoride is a naturally occurring mineral that strengthens tooth enamel, helps reverse minor decay and helps neutralize acid that can damage teeth.

It is also possible to reverse tooth decay in the very early stages. Tooth enamel can repair minor damage itself by replacing lost minerals from saliva or fluoride.