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... plaque . Benson PE , et al . J Orthod . 2004 Mar ; 31 ( 1 ) : 41-6 ; discussion 16 . [ Effect of chewing sugar - free gum after sucrose challenge on dental plaque pH in situ ] Dong YM , et al . Zhonghua Kou Qiang Yi Xue Za Zhi . 2003 ...