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Crest 3D Whitestrips ($35, originally $46)

Crest Whitestrips are a classic you shouldn't overlook. One of our editors used them for just three consecutive days leading up to her wedding and saw significant results in that short amount of time. (See the before and after pictures in our Crest 3D Whitestrips review.) They're worth the slight discomfort and arguably much more comfortable, convenient, and affordable than a professional treatment.

Editor Quote: "After just four treatments, the difference is already remarkable. The "before" image on the left and the "after" image on the right clearly shows the noticeable change. And I've barely made a dent in the box with plenty of treatments left." — Marisa Petrarca, former contributing shopping editor