Management of a case of internal root resorption is a challenge to the endodontists.Internal resorption of teeth is an insidious process and is generally found in teeth with previous history of trauma.It may occur in cases with chronic pulpal inflammation, following caries or due to trauma in the form of an accidental blow. Internal resorption is very often noticed in anterior teeth, due to their susceptibility to trauma. However, it may be seen in posterior teeth, most likely because of carious involvement of the pulp. Early diagnosis, removal of the cause, proper treatment of the resorbed root is mandatory for successful treatment outcome. This case report describes the management of theresorptive defect in the apical 1/3rd whichwas treated nonsurgically with thermoplastized guttapercha technique. A six-month follow up demonstratedclinically asymptomatic and adequately functional tooth, with radiographic signs of healing