Table 1.

The percentage of DNA in the comet’s tail, in the studied samples, means [95%, CI], %

Cultivation time	The percentage of DNA in the comet’s tail, in the studied samples (%)
	0 µg/ml NaF	20 µg/ml NaF	100 µg/ml NaF	200 µg/ml NaF	H2O2 100 μM for 2 min
48 h	1.38 [1.24–1.52]	3.79 [3.46–4.13]**	4.09 [3.86–4.33]**	4.47 [4.20–4.76]**,##	4.89 [4.65–5.13]
72 h	1.18 [1.01–1.36]	1.15 [1.01–1.30]	2.16 [1.89–2.43]**,##	2.76 [2.30–3.21]**,##	3.42 [3.05–3.80]

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