Whitening teeth can be maintained long time?

　　Internationally renowned dental experts say the U.S. dental technology cold light filtered mainly through the filter without any allergic reaction to Blu-ray will penetrate the U.S. dental agent to melanoma cells in the inner dentin, enamel absorbed through the decomposition of pigment cells, which in turn has to restore the role of white teeth. Teeth whitening can be maintained for long time is based mainly on the United States who seek to do as well as the number of teeth whitening, teeth care for the United States.

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