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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The shift from basic white or gel toothpastes to a variety of modern options has made the simple act of brushing teeth more complicated. The three popular types of toothpaste available today are white ...

SINCE LAST YEAR, Colgate has been using color theory to fix yellow stained-teeth through its Colgate Optic White Purple Toothpaste. On Sept. 15, they released the Colgate Optic White Purple Serum for ...

Add Yahoo as a preferred source to see more of our stories on Google. Hundreds of Aussies are claiming whitening products have caused problems with their teeth after one woman online alleged "purple ...