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I have used the Crest-White strips and they didn't do anything for me. I also used another brand that was similar and had the same results. I spoke to my dentist and he suggested doing the tray thing where you add the gel and the whiten overnight, but that isn't cheap. There is also a lasr technique, which is relatively new, that whitens your teeth. This costs around $10,000 CAD and my dentist says that it isn't preoven and actually does nothing. I'm strating to think my dentist is a bit of a wacko. Anyhoo, there it is. I'm actually having brace work at the moment and will pursue teeth whitening after that.
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