Teeth bleaching with low concentrations of hydrogen peroxide (6%) and catalyzed by LED blue (450 ± 10 nm) and laser infrared (808 ± 10 nm) light for in‐office treatment: Randomized clinical trial 1‐year follow‐up

Objectives The aim of this study was to evaluate color longevity after a year of in‐office bleaching with gel (6% hydrogen peroxide HP, LED blue/laser infrared activation system) compared to a 35% control concentration in a split‐mouth study model. Materials and Methods Thirty‐one patients were initially treated. The bleaching procedure with 6% or 35% gel HP was performed randomly in the upper half arcade of each patient. The color was measured at baseline and at 1 week, 1 month, and 1 year using the spectrophotometer Vita Easyshade, Vita Bleached, and Vita classical Shade guide organized by value. During the 1‐year recall, the color was assessed before and after dental prophylaxis. Results Only 27 patients were assessed in the 1‐year recall. There was a significant difference in the ΔE between the two groups at all times assessed (P