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.

If you’ve spent some time here at HuffPost Shopping, you might have noticed we have a thing for electric toothbrushes. Our readers can’t get enough of them, from the ones with built-in water flossers ...