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lynx
Constable_Savage
What's the best bang method for buck teeth whitening?
Google says this - Hydrogen peroxide is a mild bleach that can help to whiten stained teeth . For optimal whitening, a person can try brushing with a mix of baking soda and hydrogen peroxide for 1–2 minutes twice a day for a week. They should only do this occasionally.
Sounds reasonable, guess you'd want to be careful to make the correct combination.