 As of 2012, 25 countries have artificial water fluoridation to varying degrees, 11 of them have more than 50% of their population drinking fluoridated water.A further 28 countries have water that is naturally fluoridated, though in many of them the fluoride is above the optimum level.As of 2012 about 435 million people worldwide received water fluoridated at the recommended level, about 211 million of them living in the United States.