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"  The holiday season is gearing up and seasonal get-togethers are popping up on your calendar. Before you start spreading holiday cheer, you might want to spruce up your smile - and here in the Beauty Lab, we&amp;#039;ve been working to find the best products for you to use. In the last few years since we last tested tooth whiteners, there have been numerous new products and innovations on the market that we couldn&amp;#039;t wait to check out. We looked at three different kinds of teeth whiteners: strips, trays and the newest category, devices, including one-time/&amp;quot;instant&amp;quot; products and those that work over a period of time. Each tooth whitener was tested at home by twenty people, half of whom had their teeth analyzed in the lab. For the lab analysis, we measured the shade of our panelists&amp;#039; teeth in a light controlled room using the Ivoclar Vivadent Chromascop Tooth Shade Guide--a set of model teeth of varying shades--both before and after testing.    Best Overall was Crest 3D White Professional Effects Whitestrips with Advanced Seal ($50), which from our lab analysis, lightened teeth an average of over two shades. These strips are used for just thirty minutes for twenty days, and testers found them very easy to use. The Advanced Seal technology helps the strip hug tightly to the teeth, so there&amp;#039;s no mess. Another plus? It&amp;#039;s a drugstore product that&amp;#039;s much more affordable than a visit to the dentist&amp;#039;s chair.  Another great option from Crest is 3D White 2 Hour Express Whitening Strips ($55), which whitens in just two hours. While it&amp;#039;s not quite as effective as its counterpart, it was still able whiten teeth effectively and in a single two-hour session. This product also features Advanced Seal, so like the other Crest, it stays neatly in place for two hours.  Want whiter teeth in a flash? Go Smile Whitening Light works in just 30 minutes and should lighten about one to two shades. Since this is a device (it uses a battery-operated light to activate a gel on your teeth) it can be used several times over with the use of the additional gel ampoules, which makes it worth the higher price point ($198). If you have sensitive teeth, this one might be best bet for you - both Crest strips caused sensitivity in a few testers, while Go Smile did not.  We hope these products get you ready for the holiday parties - let us know how you like them! "^^<http://www.w3.org/2001/XMLSchema#string>
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