Crest plasters whiten teeth by coating the teeth with a gel containing hydrogen peroxide or peroxidalcarbamide. The gel is pressed on the teeth for several minutes until it penetrates the enamel layer and removes stains and dirt accumulated on it.
Ministry of Higher Education and Scientific Research
University of Babylon
University of Baghdad
University of Technology
University of Diyala
University of Mosul
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University of Basrah
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Tikrit University
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The Great Emam University College
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