The best teeth whiteners | Popular Science

If you need whiter teeth in a pinch, this teeth whitening kit gives you results after just one use, which takes 10 minutes. It combines a light tray with a gel that can get your teeth up to eight shades lighter in one week. It uses carbamide peroxide, which many dentists deploy in their offices. If your teeth don’t whiten to your liking, you can get a full refund.

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