Introduction
INFLAMMATORY RESPONSE
At-home bleaching, a technique for vital teeth, consists of applying a bleaching gel in low concentrations, distributed in individual trays and performed by the patient. TS is explained by the inflammatory response of the pulp, which is a consequence of HP penetrating the tooth structure and reaching the pulp chamber. This deleterious effect is expected to be even more relevant in younger patients (children and adolescents), as their teeth are more permeable to external stimuli due to maturation. Several manufacturers have introduced low-concentration (HP 6–20%) in-office bleaching gels to the market, A recent Therefore, this study aimed to evaluate the efficacy of in-office bleaching with 6% HP in adolescents using different application tips, as well as the risk and intensity of TS and aesthetic self-perception. We tested the following four null hypotheses: when performing in-office bleaching with 6% HP in adolescents, the use of different application tips 1) will not affect color change; 2) will not affect the absolute risk of TS; 3) will not affect the intensity of TS; and 4) will not affect aesthetic self-perception.