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Smile Bright is a private company that specializes in unique tooth whitening processes. The Bright Teeth Whitening Kit at Smile Bright whitens teeth by removing current stains. It does not "increase" your teeth whitening. Your teeth will not be whiter than when you grew permanent teeth. If you have veneers, composite (white) fillings, implants or other synthetic tooth structures, whitening gel will remove surface stains, but their base color will remain the same. If your teeth are light gray, have multiple colors, or are stained with drugs (such as tetracycline), your teeth may require multiple treatments to achieve satisfactory results. The whitening gel is placed in the braces, suitable for upper and lower teeth. The active ingredient in the gel is a fortified hydrogen peroxide.