Table 3. Effects of green tea extract, EGCG, black tea extract, and theaflavins on killing of a F. nucleatum pre-formed biofilm.

Compound	MBC (μg/ml)	Relative killing (%)
		5 min	15 min	30 min
Green tea extract	1000	24.25 ± 11. 18	36.33 ± 14.45	54.40 ± 9.13
EGCG	1000	18.04 ± 15.11	42.70 ± 2.34	62.44 ± 7.03
Black tea extract	2000	0 ± 24.39	0 ± 7.43	34.6 ± 9.15
Theaflavins	500	0 ± 13.55	0 ± 16.48	41.26 ± 11.93
Chlorhexidine	4	0 ± 8.60	8.35 ± 2.63	14.22 ± 1.50

Chlorhexidine was used as a positive control.