Table 2. Antimicrobial effect of 0.2% chlorhexidine and 10% lidocaine against 6 oral bacterial species.

Bacterial species	Antimicrobial score
	0.2% chlorhexidine Exposure time (min)			10% lidocaine Exposure time (min)
	1	2	3	1	2	3
E. coli	4	4	4	3	3	3
S. viridans	4	4	4	3	3	3
S. salivarius	4	4	4	1	1	1
S. aureus	4	4	4	0	0	0
E. faecalis	0	0	0	0	0	0
S. pyogenes	0	0	0	0	0	0

Antimicrobial score: 4 = >95% bacterial reduction, 3 = 60–95% bacterial reduction, 2 = 40–60% bacterial reduction, 1 = 5–40% bacterial reduction, 0 = <5% bacterial reduction