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 ...

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 ...

Have you ever seen a photo of yourself, checked your smile, and thought, "I could use some teeth whitening"? Well, a lot of us have been there. The good news is that you can give your smile a little ...

While many of us pine for toothpaste-commercial-white teeth as much as we do symmetrical features or a thick head of hair, the desire for a brighter smile isn't just a matter of vanity. Research ...