Teeth whitening with hydrogen peroxide and baking powder?

Hey, Ive recently started doing this each night before i go to bed; Mixing up some baking powder with some hydrogen peroxide, brushing visible teeth with it, then rinsing throroughly and then brushing with a different toothbrush and with regular tooth paste. Has anyone tried this? If so how long will it take to notice a difference? Thanks in advance X
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After trying this a few months ago, I saw results after five days. I now have abnormally white and strong teeth. Using whitening toothpaste afterward helps, along with some rinse with the same duty.
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