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Why not? Because they'll yellow your teeth eventually. They contain abrasive ingredients like baking soda, which scrape off a little bit of tooth enamel by way of "whitening" your teeth. At first, you might think your teeth look a little whiter. But over the months and years, as enamel is gradually removed, the layer below the enamel will show more and more. That layer is the dentin, which...
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