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Antimicrobial activity of EGCG against S. mutans. The bacteria culture that added different concentrations of EGCG was incubated for 3 hr and 5 hr at 37°C. The viability (%) is represented as a percentage of the colonies that EGCG cell culture is compared with control. The result of viability analyzed by t-test. Standard deviations indicated by error bars were calculated from 3 independent experiments. * Significantly different from the untreated control (*P<0.05).
