If, like me, you're a big fan of tea and coffee, you'll know these brown-coloured hot drinks ... particles that can contribute to staining between teeth. And finally, use a tongue scraper to ...

One of the most frequent causes of black lines is tartar, a hardened form of plaque that collects around the gum line. When ...

There, he encountered people who had dark brown stains on their teeth — but no sign of tooth decay. He spent years trying to understand the phenomenon, but he died before the answer was ...