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Teeth whitening is one of the easiest and most effective at-home beauty treatments you can do. It only takes a few minutes of passive effort a day to brighten your smile by a few shades. The downside: Teeth whiteners can be pricey. But in an exciting Amazon Prime Day deal, the popular Crest 3D Whitestrips are on sale. The 28-strip teeth-whitening kit regularly costs $45. Right now, Crest 3D Whitestrips are marked down to $29.Touting more than 15,000 reviews and a 4.5 out of 5-star rating on Amazon, Crest Whitestrips have had more than a decades-long following. Our Good Housekeeping Institute Beauty Lab experts were just as impressed by the brand: We named Crest 3D Whitestrips as the best at-home teeth whitening kit after testing, calling them the "gold standard for smile brightening." Lab evaluation revealed that after 20 days of daily use, teeth were noticeably two to four shades lighter. The brand claims that the hydrogen peroxide strips provide "professional-level" teeth whitening results, removing 14 years of stains in just 30 minutes a day for about two weeks. Its advanced seal technology makes it possible to talk and drink water while you're using the strips to whiten your teeth. And if you're looking for quicker whitening before a big day or a photo shoot, Crest is also slashing prices on its Whitening Emulsions (another favorite the GH Institute's Beauty Lab) and its 1-Hour Express Whitestrips. If you're looking for a surefire way to whiten teeth at home — at a great price — now's the time to buy.More of the Best Prime Day Crest Whitestrips DealsMobile app users, click here to view the above gallery.