Tons of toothpastes promise to give you whiter teeth, but very few offer instant results. Luster NOW! Instant Whitening Toothpaste ($8.99, walgreens.com) uses Bluverite technology, which deposits blue brighteners that makes teeth appear whiter after one use (similar to the effect you get from wearing blue-red lipstick). If you're into toothpaste that will gradually whiten over time, try Listerine Whitening Original Gel toothpaste ($5.45, soap.com). Do At-Home Beauty Devices Really Work?