Computer models show that fluoride locks calcium into your pearly whites.
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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