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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Thanks for your great questions, Amelia. I’m a dentist, so I know a bit about how toothpaste works and what we used before it was invented. Toothpaste makes your mouth smell fresh and feel clean. If ...

Brushing your teeth is one of the most basic habits in daily life. Most people believe that using any toothpaste is enough to keep their teeth healthy. But have you ever wondered if your toothpaste is ...