Table 3.

Mean and SD for ΔE for different tested groups at all the time intervals within dentin under light exposed conditions.

Dentin	Light						p-Value
	SDF		SDF + GSH		SDF + KI
	Mean	SD	Mean	SD	Mean	SD
Immediate	2.47 b	0.57	3.38 a	1.18	4.50 a	1.00	0.002 *
3 h	8.43	1.23	7.12	0.74	7.82	1.42	0.095 NS
6 h	9.65 a	1.32	8.17 b	1.09	8.33 b	1.00	0.016 *
24 h	14.40 a	1.67	11.50 b	1.12	9.12 c	0.92	≤0.001 *
48 h	19.16 a	1.72	12.98 b	1.10	10.42 c	0.73	≤0.001 *
72 h	21.30 a	1.21	15.36 b	0.71	11.60 c	0.99	≤0.001 *
7 days	23.91a	1.94	18.55 b	0.77	13.04 c	0.83	≤0.001 *
10 days	27.94 a	1.18	21.63 b	0.58	12.74 c	0.72	≤0.001 *
14 days	27.52 a	1.15	25.67 b	0.45	13.96 c	1.12	≤0.001 *

Means with the same letter (a, b or c) within each row are not significant (NS), and (*) means significant at p > 0.05.