A nice smile is one of the first things we notice about a person. That is probably why Americans spend so much money on tooth whitening products, about 1.4 billion dollars each year. Many of us are still using the…
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A nice smile is one of the first things we notice about a person. That is probably why Americans spend so much money on tooth whitening products, about 1.4 billion dollars each year. Many of us are still using the…