Treatment of External Cervical Resorption and Its Late Complication: A Case Report

External cervical resorption is a type of pathological root resorption that is often asymptomatic. It leads to progressive loss of dental hard tissues while the pulp usually remains vital. The first symptom reported by a patient may be a pink shadow at an esthetic zone. This case report describes the treatment of external cervical resorption of a first upper incisor according to the new classification, treatment and management methods introduced in 2018. After 30 months the endodontic treatment was performed due to pulp necrosis and symptomatic apical periodontitis.