For ivory keys, which are porous and can absorb substances applied to them, it's crucial to use plain white toothpaste. Gel or colored toothpaste might corrode or discolor the ivory. Even for plastic ...

PopWhite is a two-part system that includes a primer (toothpaste) and a toner (mouthwash). The combo will leave your mouth feeling refreshed and clean, but the power is in the purple color.

“Purple toothpaste takes advantage of the color theory — complementary colors ... This can create the optical illusion of bright white teeth, she explains. It works on natural and manufactured ...