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S. mutans biofilm images after treatment with antimicrobial polymers and chlorhexidine (CHX). The biofilms after antimicrobial treatment were stained by a LIVE/DEAD® staining kit and imaged by confocal scanning laser microscopy. Green color (SYTO® 9) showed live bacterial cells, and red/orange color (propidium iodide) showed dead bacterial cells. 0.001% acetic acid was tested as solvent control. [Polymer or CHX] = 125 μg/mL. Bar = 30 μm.
