Table 1. Percentages of reduction of Enterococcus faecalis biofilms by alexidine alone and combined with NAC after 1 min of exposure: mean (SD).

	E. faecalis ATCC 29212		E. faecalis D1
ALX concentrations/%	Alone	Combined with NAC	Alone	Combined with NAC
2	E	E	E	E
1	E	E	E	E
0.5	E	E	E	E
0.25	E	E	E	E
0.125	E	E	E	E
0.062 5	E	E	E	E
0.031	E	E	E	E
0.015 6	E	99.75 (0.18)a,1	99.92 (0.13)a,2	99.70 (0.39)a,1,2
0.007 8	99.46 (0.57)1	97.22 (2.00)b,2	99.50 (0.48)b,1	99.23 (0.50)b,1

ALX, alexidine; E: eradication, 100% bacterial kill; NAC, N-acetylcysteine, 100 mg⋅mL⁻¹.

Read vertically, the same letter shows differences not statistically significant.

Read horizontally, the same number shows differences not statistically significant.

E. faecalis ATCC 29212: ALX 0.007 8% vs. ALX 0.007 8%+NAC, P<0.001.

E. faecalis D1: ALX 0.015 6% vs. ALX 0.015 6%+NAC, P=0.104; ALX 0.007 8% vs. ALX 0.007 8%+NAC, P=0.163.