Abstract
This study derives from a doctoral thesis from Taynara Carneiro, which is under development.Conflict of interestThe authors declare no conflict of interest.Editor: Linda WangDespite the availability of in-office bleaching gels with a 6% concentration of hydrogen peroxide (HP), these gels have not been evaluated in younger patients. They are commercially available with a tip, associated or not with a brush, where the tip with a brush spreads the gel over the entire surface to have a smaller thickness (thin layer) since the manufacturers indicate the application of a thin layer of gel.