Bite’s whitening gel cuts out the need for the tray, as you can brush the gel directly on to your teeth. Compared to the Opalescence Go Kit, this one is a little messier and labor-intensive to use.

These prefilled Opalescence teeth whitening trays are easy to take on the go. They contain 15% hydrogen peroxide with a minty flavor, and each pack comes with 10 treatments.

For many people, whitening toothpaste is the easiest and most affordable tool to turn to if you're trying to brighten up your smile. While a solid toothpaste marketed for its teeth-whitening ...