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Can brushing with a hydrogen peroxide – baking soda paste really whiten your teeth?

I’ve heard that brushing with the said mixture can be an effective, not to mention dirt cheap, alternative to whitening your teeth. Has anyone tried this? What kinda of risks are involved in doing this, if any? Should/can it be used daily? Weekly?

Of course, this would be used in conjunction to brushing with a regular fluoride based toothpaste, along with mouthwash and flossing.

Thanks,