Introduction: this systematic review evaluated radiographic methods that allow to detect external root resorption (err) in orthodontics, to determine adequate time intervals for control radiographs, and to identify radiographic characteristics of err. Materials and methods: we carried out systematic electronic and manual searches in databases, without year restrictions, limited to papers in Spanish or English. We included cohort studies and randomized clinical trials performed on human subjects that assessed orthodontic movement with fixed appliances that recorded root resorption before or during the course of treatment. Two authors evaluated the articles independently and extracted the ones to be selected in a standardized format. Results: the initial search yielded 285 references. 40 articles that could be related to the topic were then identified by title and abstract. After the evaluation using the inclusion criteria, 26 articles were analyzed. Due to the heterogeneity among the articles, it was not possible to estimate a global measurement for the research questions. Conclusion: the ideal method for the detection of external root resorption (err) caused by orthodontic treatment is the cone-beam tomography, however periapical radiographies may be a useful tool. When such radiographies are used as a diagnosis method, they must be taken with a 6-month periodicity and the decrease in root length must be evaluated.

Currently there is a significant increase the in demand for procedures associated with dental esthetics. Asa result, in recent years many systems have been developed for tooth bleaching through different forms ofapplication. Despite its widespread use, it has been argued that this process can alter not only the structure ofthe enamel surface, but can interfere with bonding procedures required to carry out orthodontic treatment.Different studies have showed that in patients receiving dental treatment clearance, adhesion processes arenot as efficient as those who did not.This article presents a literature review on the current state of tooth bleaching, and the relationship and / oreffect on orthodontic treatment when it is done before, during or after bleaching.Key words:Malocclusion angle class III, Bone anchor, Orthodontics. Actualmente se presenta un aumento importante de la demanda por procedimientos asociados a la estéticadental. A consecuencia de ello, en los últimos años se han desarrollado múltiples sistemas para realizar elaclaramiento dental por medio de diferentes formas de aplicación. A pesar de su amplio uso, se ha discutidoque dicho proceso puede alterar no solo la estructura de la superficie del esmalte, sino que puede interferiren los procedimientos de adhesión que se requieren para llevar a cabo un tratamiento de ortodoncia.Diferentes investigadores han realizado estudios que demuestran que, en los pacientes que han recibidotratamientos de aclaramiento dental, los procesos de adhesión no son tan eficientes como en aquellos queno lo recibieron.En este artículo, se presenta una revisión de literatura sobre el estado actual del aclaramiento dental, y la relacióny/o efecto que tiene en el tratamiento de ortodoncia, cuando éste se hace antes, durante o después del mismo.Palabras clave:Aclaramiento dental, Ortodoncia, Esmalte dental, Tags de resina, Adhesión.