Efficacy of Mouthwashes Containing Hydrogen Peroxide on Tooth Whitening

Table 3

Means and standard deviations (SD) of color changes () after whitening.

Group	(SD)
	Time 1	Time 2	Time 3
AS	1.23 (0.45)^Aa	1.98 (0.76)^Aa	2.28 (1.35)^Aa
CR	5.82 (1.43)^Ba	7.85 (2.71)^Ba	12.42 (4.47)^Bb
LS	8.51 (1.45)^Ba	11.35 (3.93)^Cb	14.70 (3.39)^Bc
SC	7.84 (1.72)^Ba	10.88 (3.03)^Cb	14.34 (4.87)^Bc
OP	12.18 (4.37)^Ca	21.35 (2.73)^Db	20.28 (5.63)^Cb

Different uppercase letters represent statistically significant difference among groups. Different lowercase letters represent statistically significant difference at the time intervals evaluated ( < 0.05).