Despite decades of evidence that fluoride prevents cavities, the agency said the best way to keep kids' teeth strong is to stop eating so much sugar.

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 news release suggested that ingested fluoride can alter a child’s gut microbiome and cause weight gain, thyroid disorders and “possibly decreased IQ.”