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In April 2015, recommended fluoride levels in the United States were changed to 0.7 ppm from 0.7–1.2 ppm to reduce the risk of dental fluorosis. [63] The 2015 Cochrane review estimated that for a fluoride level of 0.7 ppm the percentage of participants with fluorosis of aesthetic concern was approximately 12%. [15]
All Hong Kong residents receive natural occurring fluoride in water, [27] at about half the traditionally-recommended fluoride level. The Water Supplies Department fluoridates rainwater from 17 local reservoirs, in 21 treatment plants. [35] Recent tests showed drinking water to have an average fluoride level of 0.48 mg/L, and a maximum of 0.69 ...
The research had two goals: (1) to warn communities with a high concentration of fluoride of the danger, initiating a reduction of the fluoride levels in order to reduce incidence rates of fluorosis, and (2) to encourage communities with a low concentration of fluoride in drinking water to add fluoride in order to help prevent tooth decay. By ...
The same was true for fluoride levels of less than 1.5 mg/L, which is the upper safe limit of fluoride in drinking water as established by the World Health Organization.
Water fluoridation is not mandatory, and while there is a recommended fluoride concentration in drinking water (0.7 milligrams per liter) from the CDC, that level is not an enforceable standard.
Adding fluoride to drinking water reduces rates of cavities by around 25%, ... U.S. standards recommend fluoride levels of 0.7 milligrams per liter of water, and the NTP’s conclusion applied to ...