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Cho MJ.  The Tooth Whitening Effect of Toothpaste Containing High Cleaning Silica and Sodium Hexametaphosphate and the Preventive Effect of Staining by Coffee, Tea and Wine.  Int J Clin Prev Dent 2020;16:192-199.  https://doi.org/10.15236/ijcpd.2020.16.4.192