Table 2. P-values obtained after skin cold sensation threshold evaluation in different periods.

	Evaluation Periods	Group I	Group II	P-value
Bleaching Session		(Low Threshold)	(High Threshold)
1st session	1	3.067	4.143	0.7422
	2	6.732	3.034	0.00001*
	3	6.132	3.228	0.0007*
2nd session	4	6.958	7.371	0.5822
	5	4.781	4.481	0.7558
3rd session	6	4.871	6.898	0.0177*
	7	8.115	6.008	0.0159*
Post-bleaching control	8	3.078	5.822	0.0042*
	9	4.773	4.813	0.9622

^*Statisically significant differences (p≤0.05)