My understanding is that OH- ion in the hydroxyapatite complex is replaced by fluoride F- giving a fluorapatite complex which causes fluorosis. Fluor is not the prime cause for calcification in this process.
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Fluoride may also accumulate in a child's pineal because significant amounts of calcification have been demonstrated in the pineals from young children [Cooper, 1932; Wurtman, 1968; Kerényi and Sarkar, 1968; Tapp and Huxley, 197 1; Doskocil, 1984]. In fact, calcification of the developing enamel organs and the pineal gland occur concurrently.
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I'm still trying to know what causes calcification in the PG. thx for your (and futur) helps.