The Food and Drug Administration on Tuesday announced it will begin the process of pulling prescription fluoride drops and tablets for children off the market. The supplements are usually given to kids at high risk for cavities.

The federal government and some state legislatures are increasingly drawing attention to what they claim are the risks associated with fluoride, a mineral that’s been used for decades in community water systems, toothpastes and mouth rinses to prevent tooth decay.

Dentists fiercely contest the notion that the harms of fluoride outweigh the benefits.