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.

I had no idea my toothpaste could solve so many household problems. Once you see this list, you'll never look at it the same!