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Table 6 OHIP results at different time points

From: The change of teeth color, whiteness variations and its psychosocial and self-perception effects when using low vs. high concentration bleaching gels: a one-year follow-up

  Time Points
Dimension Baseline 1 week after bleaching 1 month 6 months 12 months
after bleaching after bleaching after bleaching
Functional limitation 3 (0:7) 3 (0:6) A 2 (0:6) A 2 (0:5) AB 2 (0:6) A
Physical pain 3 (0:7) 2 (0:4) A 2 (0:6) A 2 (0:6) A 2 (0:5) A
Psychological discomfort 3 (0:7) 3 (0:5) 3 (0:5) AB 3 (0:6) 3 (1:5) A
Physical disability 1 (0:4) 0 (0:3) A 1 (0:2) A 4 (0:6) A 0 (0:3) A
Psychological disability 1 (0:5) 0 (0:3) A 0 (0:3) A 5 (0:6) A 0 (0:3) A
Social disability 0 (0:4) 0 (0:3) A 0 (0:2) A 6 (0:6) A 0 (0:2) A
Handicap 0 (0:4) 0 (0:3) A 0 (0:3) A 7 (0:6) A 0 (0:2) A
Sum 14 (6:31) 10 (3:19) A 10 (0:19) A 8 (0:6) A 8 (2:22) A
  1. Expressed in median values (minimum/maximum). A: Statistically significant difference (Wilcoxon test, < 0.05) versus baseline. B: Statistically significant differences versus previous time-point (Wilcoxon test, p < 0.05)