i heard baking soda works well, & if it does, how do you do that? if not baking soda, what are some good AFFORDABLE whitening things to use? & i know of a lot of sites that give you a free sample, but are those true & do they really work? if so, which ones?
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The free trials did work for me. There is a site with some articles about teeth whitening and how to get free trials.
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