Avulsion of permanent teeth is one of the most serious complications, presenting in 0.5 to 3% of all traumatic dental injuries. The prognosis depends on the timeliness of the management following trauma, on the specialised attention received after the avulsion and on the extraoral time of the avulsed tooth. Failure to provide appropriate management may lead to inflammatory or replacement/ankylosis external root resorption (ERR). When the latter type of EER occurs, decoronation and root submergence are often proposed as treatment plan. This case report addresses the management of an avulsed tooth that was treatment-planned for a decoronation procedure. Palabras clave: avulsion, decoronation, root resorption