Summary A replanted maxillary left lateral incisor developed extensive external root resorption three months after traumatic intrusion of the tooth and its accidental avulsion during repositioning. The tooth was treated for six months with an intracanal paste of calcium hydroxide and camphorated parachlorophenol. When the area of root resorption showed radiographic evidence of calcific healing, the root canal was obturated with guttapercha. A one-year follow-up radiograph showed no evidence of renewed external root resorption.