What ion is sometimes added to drinking water to help prevent tooth decay?

Fact

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The controlled addition of fluoride to drinking water is a public health measure implemented since the mid-20th century to prevent cavities. Fluoride promotes the remineralization of enamel and makes teeth more resistant to acid attacks produced by bacteria. Numerous population studies conclude that there is a reduction in cavities when the concentration is adapted. As with any substance, the dose matters: excess during tooth formation can cause dental fluorosis. Health authorities therefore set limits and monitor water quality in order to maintain the preventive benefit while controlling the risks.