Root resorption is the progressive loss of dentine and cementum through the continued action of osteoclastic cells. In the primary/mixed dentition this is a normal physiological process in exfoliation of deciduous teeth but in resulting the adult dentition is largely pathological. The process of resorption may be self-limiting and go undetected clinically. Once initiated, if the initial surface resorptive process is sustained, for example by infection and/or pressure, dental hard tissue destruction will continue and tooth tissue loss may occur. This may result in the tooth becoming...