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 ...

From being targeted at town meetings and by Cabinet officials, fluoride is under the microscope. Why is it controversial, and where is it added?

It can be found in drinking water, some food and beverages, toothpaste, mouth rinses and dental treatments such as fluoride varnish ... In Hong Kong, 0.5 ppm (parts per million or milligrams ...