Dentists have a responsibility to prevent tooth loss whenever possible and everything should be done to keep the patient away from an edentulous state. Overdenture is defined as a removable partial denture or a complete denture that covers and rests on one or more remaining natural teeth, the roots of natural teeth, and/or dental implants (GPT-6). Whenever there is extraction of teeth, resorption of the bone takes place. When tensile stresses are applied on the bone like when occlusal forces are transmitted to the alveolus by the periodontal ligament, additional bone formation takes place. This principle is used in overdenture treatment. Preventive prosthodontics emphasizes upon the importance of procedures that can delay or rectify the future problems in a prosthesis and the overdentures are the optimum method to achieve this requirement. Advantages of overdenture are maintenance of alveolar bone, sensory feedback, minimal load threshold, reduction of psychological trauma, and intact tactile sensitivity discrimination. In this study, we will present a case report of overdenture treatment using castable ball and socket attachments. How to cite this article Sharma HK, Padiyar N, Kaurani P, Singh DP, Meena S, Gupta A. Tooth-supported Overdenture using Castable Ball and Socket Attachments. J Mahatma Gandhi Univ Med Sci Tech 2017;2(2):106-108.