Dens invaginatus is a developmental dental anomaly that occurs when the enamel organ is folded into the dental papilla prior to calcification of dental tissues. Endodontic treatments of the teeth with Dens invaginatus can be difficult and complex due to their atypical anatomy. In this case report, non-surgical endodontic treatment of maxillary lateral incisor with Oehlers Type II Dens Invaginatus is presented. The patient complained of pain and localized swelling. With the anamnesis, it was learned that the tooth had previously received endodontic treatment but the symptoms did not disappear. After the old canal filling was removed, conventional root canal treatment was applied. Periapical healing is observed in followup radiographs and the tooth is asymptomatic.