Did this stuff for 3 weeks, every day for 20 minutes, on my top row of teeth so I could compare to the bottom.Had only 4 cups of coffe during this period, and nothing else staining such as red wine or tobacco.Can't see any difference at all.Think I did everything right.If I want to whiten, no more of these strips or gels or whatever, it's to the dentist I go.Save 74% Off
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