Fluoride, a naturally occurring mineral, is commonly added to public drinking water to prevent tooth decay, a practice endorsed by numerous health authorities.
Americans on Tuesday voted to decide whether Kamala Harris will win the race to the White House or Donald Trump will retain the top post for a second time.
Counting has begun for the US elections and Donald Trump has been announced the winner in the Red states of Indiana and Kentucky and Kamala Harris in the Blue state of Vermont by American networks.
Donald Trump sought to undermine Tuesday the credibility of voting in the biggest city of must-win Pennsylvania, a soundly Democratic area that was part of the ex-president's unsupported 2020 fraud claims.
Elon Musk was sued in a proposed class action on Tuesday by registered voters who signed his petition to support the Constitution for a chance to win his $1 million-a-day giveaway, and now claim it was a fraud.
The state of democracy, the shape of the economy and abortion are the most important issues for American voters in the US presidential election, according to the first wave of exit polls.
Nearly three-quarters of voters in Tuesday's presidential election believe American democracy is under threat, according to national exit poll data from Edison Research
Minnesota Governor Tim Walz, the running mate of Vice President Kamala Harris, expressed optimism that former President Donald Trump will accept the election results even if he loses, CNN reported.
The FBI warned of bomb threats at polling stations in "multiple" US states on Election Day, adding that none were credible but many appeared to originate from Russia.
Polling aggregator FiveThirtyEight has named Kamala Harris as its favourite to win, switching from Donald Trump.