Table 3.

Statistical analysis for mean ± St. deviation of VRS and VAS and P-value for the effect of different periods on post-bleaching teeth sensitivity within each bleaching protocol

	High light intensity		Descending light intensities
	VRS	VAS	VRS	VAS
Baseline	0a	0a	0a	0a
1-day post-bleaching	2.1 ± 0.7b	42.1 ± 7.1b	1.3 ± 0.4b	28.3 ± 15.5b
2-days post-bleaching	0.5 ± 0.5c	10.5 ± 12.4c	0.3 ± 0.4c	8.3 ± 12.3c
1-week post-bleaching	0a	0a	0a	0a
P-value	< 0.001*	< 0.001*	< 0.001*	< 0.001*

Different superscript letters within the same row indicates a statistically significant difference at p ≤ 0.05;

^*: significant (p ≤ 0.05); NS: non-significant (p > 0.05).