What is the best and most effective brand of whitening strips?

I'm looking to whiten my teeth after having braces. What the best kind to get that will make my teeth the most white? Thanks!
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Probably the Crest Whitening Strips you get from your dentist. They have some that are strips and other more expensive ones that go in trays. I've done the strips before and they work (cost around $100). When I get my braces off I am going to get the trays. They cost around $200.
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