Fig. (2) Representative results of oral biofilm reduction after various treatments. Growth of bacteria was compared to the negative control, Phosphate-Buffered Saline (PBS). A) after using 0.12% chlorhexidine mouthwash followed by 10% lidocaine; B) after using 10% lidocaine; C) after using 0.2% chlorhixidine; D) after using lidocaine-chlorhexidine preparation I; E) after using lidocaine-chlorhexidine preparation II.