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Colony-forming unit (CFU) counts of planktonic bacteria in growth medium: (A) total microorganisms, (B) total streptococci, and (C) mutans streptococci (mean ± sd; n = 6). Adding NAg into VT greatly decreased the CFU counts of the planktonic bacteria in the growth medium away from its surface. In each plot, values with dissimilar letters are significantly different from each other (p < 0.05).
