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 ...

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

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Purple toothpaste isn't actually whitening your teeth — it's using color theory to cancel out the yellow. Purple sits opposite yellow on the color wheel, so Hismile's "color correcting serum" is ...

Add Yahoo as a preferred source to see more of our stories on Google. A close up of someone smiling. At-home teeth whitening kits or toothpastes are great for getting a whiter smile at home without ...