Add Yahoo as a preferred source to see more of our stories on Google. How does purple toothpaste work? It uses color theory’s principle of complementary colors. Complementary colors are shades that ...

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From charcoal to purple toothpaste and oil pulling, a dentist separates teeth whitening facts from social media fiction.

The word has been going around for quite some time now, but not all of us have been quite sure enough to actually put it to experiment. The simple answer is that purple toothpastes do work, but the ...