does baking soda help your teeth to become whiter directly? If not, what are some ways to whiten teeth?

yes, i brush twice a day for at least 2 minutes each time, and don't eat much candy, I just want to find a way to whiten teeth.
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Baking Soda helps to whiten teeth but it takes a long time. The BEST product that I have found can be bought at WalMart... it's called "Rembrandt 2 Hour Whitening" and it costs about $18.00. Really works tho!
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