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　　Chromosomal damage and interference with DNA repair.[29]:304 Overall, the literature from in vitro and rodent studies does not indicate genotoxicity, but the in vivo human studies are inconsistent.[29]:316

　　Four epidemiological studies have noted a correlation between increased fluoride and low IQ.[29]:205-223 The most rigorous of these compared an area with mean water concentration of 0.36 ± 0.15 mg/L (range 0.18-0.76 mg/L) to an area with 2.47 ± 0.79 mg/L (range 0.57-4.50 milligrams per liter [mg/L]). Most of these studies did not publish important details, making them difficult to evaluate. If these correlations are caused by fluoride, the mechanism is not known, but the National Research Council speculates that effects on the thyroid could lead to poor test results.[29]:208

　　Inhibition of melatonin production and promotion of precocious puberty in animal studies.[47] Fluoride may have an analogous inhibitory effect on human melatonin production, as fluoride accumulates readily in the human pineal gland, the brain organ responsible for melatonin synthesis.[48]

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