If Donald Trump is elected for a second time, his presidency may threaten what's lauded as one of the top public-health triumphs of the 20th century: adding fluoride, a mineral that helps prevent tooth decay, to drinking water. That’s due to Robert F.

The CDC calls the practice of adding fluoride to tap water systems one of the 10 greatest public health achievements of the last century.

In the upcoming election, fluoride in drinking water has become a topic of debate after Robert F. Kennedy Jr. claimed Donald Trump would remove it on his first day in office if elected.