Computer models show that fluoride locks calcium into your pearly whites.
References
de Leeuw, N. H. Resisting the Onset of Hydroxyapatite Dissolution through the Incorporation of Fluoride. Journal of Physical Chemistry B, published online, doi:10.1021/jp036784v (2004).
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Peplow, M. How fluoride firms up teeth. Nature (2004). https://doi.org/10.1038/news040119-8
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DOI: https://doi.org/10.1038/news040119-8
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