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 glycerin to sodium fluoride, shop bought toothpaste is a roll call of iffy-sounding ingredients. Much safer to make your own ... if only it didn’t look so much like thick, grey sludge I know ...

Toothpaste is something most of us use daily. But did you know that most conventional brands contain at least one harmful ingredient? Ingesting a small amount of these ingredients twice a day, adds up ...