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Hmm, I shouldn't think it would be able to achieve any real bleaching of the teeth. So I suspect it is just acting as a surface stain removed. Given it's known to be used, when made into a paste, as an abraisive, I'd tend to be a little cautious about using it too often on teeth, or at least see what your dentist has to say first, just in case it might, when used often, be overly abraisive.
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