Endodontic treatment aims to eliminate infection from the root canal system and prevent reinfection of periapical tissues. Inadequate endodontic procedures, such as insufficient canal debridement, improper working length determination, or poor obturation, may result in persistent intracanal infection. This can lead to periapical inflammation and the development of swelling, commonly presenting as a dentoalveolar abscess. Such complications not only cause patient discomfort but may also compromise the prognosis of the affected tooth. This case report highlights a clinical presentation of facial swelling resulting from failed endodontic treatment and discusses its management












