One of the most feared complications after orthodontic treatment is the external root resorption. Root resorption leads to shortening of root and thus, the integrity of teeth arch is broken down. Both the cervical and apex zones of the roots can be affected by it due to orthodontic forces involved in the tooth movement. The future of the teeth involved may also be compromised due to orthodontic treatment. It is necessary that the patient is pre-informed about the root resorption's risks as a result of orthodontic treatment. It is possible to detect the orthodontic-induced root resorption both during the active phase of treatment and after the orthodontic treatment. The degree and severity of orthodontic-induced root resorption are dependent on a number of factors involving environmental factors and the host himself. The paper talks about the root resorption, its degree of severity, mechanism, detection methods, and significant correlation with individual susceptibility, tooth structure, fixed appliance treatment, orthodontic tooth movement, orthodontic force, and treatment duration.