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" The handheld light for the Go Smile Smile Whitening Light ($198, gosmile.com) comes with ampoules of a hydrogen peroxide-based serum that&amp;#039;s applied to teeth; the light then activates the whitening agent.  To evaluate the claim, Good Housekeeping Research Institute experts recorded the shade of volunteers&amp;#039; teeth before sending them home with the Smile Whitening Light and instructions. The next day, volunteers returned to the lab for another tooth-shade evaluation.  The verdict: The device lightened teeth an average of 1.6 shades. As with all whitening treatments, the greater the tooth discoloration, the more pronounced the results \u2014 one tester&amp;#039;s teeth lightened five shades. And while some volunteers didn&amp;#039;t like having to hold the light, at least half were satisfied with the degree and speed of whitening. As one tester noted, &amp;quot;I liked the results and that it was all done in 30 minutes, versus a product you have to use daily for weeks.&amp;quot; "^^<http://www.w3.org/2001/XMLSchema#string>
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