This kit is simply excellent. The lightening itself seems to work after a few uses, but it was kind of a pain. The gel is fairly easy to apply to teeth with the included application brushes, but the mouthpiece only stays on for 2 minutes and then turns off. It's tiresome to keep track of how often you turn it on. I finally wrote CS how to leave the light on longer and here is the answer I got. When you enable AutoBrush, press the light button and it turns blue. Press the light button again and it changes from blue light to purple or a combination of red and blue light. Hold the light button again and it will turn blue. This blue light should persist for 10 minutes. Hope that helps.
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