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Kim JS, Mun YH, Shin SC.  Tongue Cleansing Effect and Reduction in Oral Malodor Using a 360-Degree Rotating Head and Sonic Vibratory Electric Toothbrush.  Int J Clin Prev Dent 2019;15:159-162.  https://doi.org/10.15236/ijcpd.2019.15.3.159