re: Best Teeth whitening product?Update page 2

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That 1 hour stuff you guys are talking about is such a high concentration of carbamide peroxide that it is basically just dehydrating your teeth temporarily and making them appear white. Don't be surprised if they get back to normal in a week or so. And if they do, be careful wanting to keep bleaching every week, because high concentrations like this can damage enamel. Your best bet for long-term results is low concentration over a period of time

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And he can do that also. He can blast with the high power stuff and then move to white strips or something for prolonged use. But this stuff whitens.