Utah has become the first US state to ban the use of fluoride in its public water, following concerns raised by health secretary Robert F Kennedy that the mineral poses potential health risks.Governor Spencer Cox signed the ban into law this week, which will go into effect on 7 May. Other states, including Florida and Ohio, are weighing similar legislation.Fluoride has been added to US drinking water since 1945 to prevent cavities.Utah's move to remove the mineral has been criticised by experts,...