The effects of fluoride on human health has long been a matter of controversy. In small quantities, fluoride has beneficial effects on oral health, especially in preventing dental caries in children, which is a major public health concern in the industrialized countries as well as others. Therefore, the Oral Health program of the WHO supports fluoride containing toothpastes and mouth-rinses, as well as fluoridation of drinking water where necessary. As indicated in a 2004 report, systematic reviews of available datasets concluded that there was no credible evidence of adverse health effects of water fluoridation, and WHO Water Quality Guidelines recommended a maximum fluoride level of 1.5mg/L.

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