Pre- and post-depigmentation OPI scores and smile aesthetic scores were compared using Wilcoxon signed-rank test
| Parameter | Pre-depigmentation | Post-depigmentation | p value | ||
|---|---|---|---|---|---|
| Mean and SD | Confidence interval | Mean and SD | Confidence interval | ||
| OPI scores | 2.67 ± 0.49 | 2.4–2.9 | 0.33 ± 0.5 | 0.0631–0.6036 | < 0.001** |
| Smile aesthetic scores | 6.72 ± 0.32 | 6.5–6.9 | 7.91 ± 0.18 | 7.8–8.0 | 0.001** |
OPI: oral pigmentation index; SD: standard deviation; ** indicates statistical significance