 As of 2012 about 435 million people worldwide received water fluoridated at the recommended level, of whom 57 million (13%) received naturally fluoridated water and 377 million (87%) received artificially fluoridated water.In 2014, three-quarters of the US population on the public water supply received fluoridated water, which represented two-thirds of the total US population.National and international health agencies and dental associations throughout the world have endorsed water fluoridation as safe and effective.