Fig.2. Essential oil effects on biofilm formation by Streptococcus mutans.Afterincubation with the treatments, the biofilms that formed on the dish surface were measured by staining with 0.1% safranin. The bound safranin was released from the stained cells with 30% acetic acid, and the absorbance of that solution was mea- sured at 530 nm. Data are represented as the means ± standard deviation. *p < 0.05 when compared with the control group. (A) Control (only S. aureus). (B) Antibiofilm action of E. globulus. (C) Antibiofilm action of E. urograndis. (D) Antibiofilm action of 0.1% NaF.