Table 3. Comparison of digital image-based color differences between enamel and white spot lesion areas (ΔE^*DI).

Values are presented as mean ± standard deviation.

Groups: 1, control; 2, home bleaching; 3, home bleaching with fluoridation; 4, in-office bleaching; 5, in-office bleaching with fluoridation.

T1, Before white spot lesion formation; T2, after white spot lesion formation; and T3, after completion of external tooth bleaching.

Repeated-measures analysis of variance with Greenhouse–Geisser correction and Bonferroni correction (α = 0.05).

^A,B,C,a,bDifferent letters indicate significant differences; upper case letters represent comparisons between rows and lowercase letters represent comparisons between columns.