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The purpose of this study was to evaluate the efficacy of two different 10% carbamide peroxide bleaching products just after treatment and after a 6-month follow-up period.  Methods . Two 10% carbamide peroxide products (Opalescence PF and Nite White ACP) were applied nightly for 14 days, according to the manufacturers' instructions. The color of teeth 11 and 21 of thirty-four subjects having A2 or darker teeth were measured with a spectrophotometer ( L   ∗ ;  a   ∗ ;  b   ∗ ) before treatment, just after treatment (14 days) and after 6 months.  Results and Conclusions . Both products produced significant whitening of teeth with total color change (Δ E    ab∗  ) of approximately 5.20 units. There was a significant improvement in all 3 color coordinates ( L *,  a *, and  b   ∗ ) for up to 6 months postbleaching ( P  < .05). Nite White showed a higher degree of relapse (27%) than Opalescence (18%) over the 6-month period. It is suggested that rebleaching after 6 months is not necessary.

A Clinical Study of the Effectiveness of Two Different 10% Carbamide Peroxide Bleaching Products: A 6-Month Followup