Table 2.

Index of the DNA-Comets, means [95%, CI]

Cultivation time	Index of the DNA-Comets
	0 µg/ml NaF	20 µg/ml NaF	100 µg/ml NaF	200 µg/ml NaF	H2O2 100 μM for 2 min
48 h	0.31 [0.28–0.42]	0.88 [0.80–0.95]**	0.97 [0.92–1.03]**	1.07 [1.00–1.14]**,#	1.17 [1.11–1.23]
72 h	0.24 [0.21–0.27]	0.26 [0.23–0.29]	0.54 [0.47–0.61]**,#	0.72 [0.60–0.84]**,#	0.90 [0.79–1.01]

**p < 0.01, Significant differences against samples treated with 0 µg/ml of sodium fluoride; ^#p < 0.05, Significant differences against samples treated with 20 µg/ml of sodium fluoride