Has anyone used the new Crest Advanced Seal whitening strips?

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Crest has come out with a new product for teeth whitening, and with all the worry about looks these days, there is the pressure to look great. That includes your teeth. Has anyone used the new Crest Advanced Seal White strips? If so does it work? Is it worth the $40 that it costs to buy them? I brush my teeth twice a day, but my teeth could deffinitely use a little whitening. Let me know what you guys think. Happy Mylotting!!!