For those of you saying to use Hydrogen Peroxide, I strongly advise that you do not. This is because Hydrogen Peroxide is a VERY powerful oxidising agent and if it is accidentally swallowed it could lead to death or loss of sight if it comes into contact with the eyes. Also it's pretty corrosive, which is definately not good for your teeth. But I do strongly advise you to use Baking soda as it is very effective, plus it's used in baking so it's not as dangerous if you swallow it.
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