Fluoride varnish has the highest concentration of fluoride of all the PATF methods (22,600 ppm sodium fluoride) and less fluoride is used per application. It has the ability to stay on enamel for ...

Fluoride varnishes are not sold over the counter, but professionals can apply them to patients who need them, Stout said — such as those who are more at risk of cavities.

A video circulating on Instagram claims sodium fluoride is the leading cause of cancer. The post pegs its evidence on similar unproven claims made by Nigerian televangelist Chris Oyakhilome during ...