Endodontists sometimes encounter with malformed teeth such as dens invaginatus. The teeth have a tooth like hard structure in them, which is actually an invagination of the same tooth structure. Endodontic treatment in these teeth are always challenging because of their varied shape making access and biomechanical preparation difficult. Wide apical foramen and thin walls of root further complicates the matter. This case report presents a case of dens invaginatus with open apex and chronic periapical abscess which was treated non surgically.