 In the English speaking nations—the United States, Canada, UK, Australia and New Zealand, all of which practice water fluoridation—many medical associations and authorities have published position statements and endorsed water fluoridation.The U.S.Surgeon General, the American Public Health Association, the Royal Commission on the National Health Service, Australian Medical Association, New Zealand Medical Association, Health Canada supports fluoridation, citing a number of international scientific reviews that indicate "there is no link between any adverse health effects and exposure to fluoride in drinking water at levels that are below the maximum acceptable concentration of 1.5 mg/L."