Do you know the best teeth whitening product to use at home?

My teeth are not very yellow or anything, but they can use a little touch up. What is the best at-home product to use?
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I smoked for quite a few years. After I quit, I wanted to whiten my teeth. My dentist told me to use this teeth whitening kit. It worked great and I appreciate not having to spend a fortune. http://best-home-teeth-whitening.info
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