INTRODUCTION - Over-the-counter, do-it-yourself (DIY) teeth whitening kits sound like a good idea for a number of reasons, including convenience, a lower cost than going to a dentist, and relative ease of use. That’s the good news. But, like everything in this world that sounds too-good-to-be-true, you also need to pay attention to the “bad news.” - These over-the-counter, teeth-enhancement kits are,...