The loss of tooth hard tissue caused by odontoclast cell action is described as external cervical resorption (ECR). ECR is commonly initiated on the cervical third of the root’s surface. This study includes a summary of the etiology, risk factors, diagnosis, and treatment of ECR. Only when the exact type and precise position of the ECR defect are identified, can effective management and the proper course of treatment be taken. A 29-year-old male patient’s general dentist noticed ECR in the upper right first premolar during a routine radiography examination. Cone-beam computed tomography (CBCT) was done to assess the lesion’s extent. Glass ionomer cement was surgically applied to the defect to fill it. Nonsurgically, root canal treatment was carried out before and after the surgical intervention. Using CBCT, combining nonsurgical and surgical approaches to manage such cases is an effective way of treatment.