Untreated periodontal disease destroys the attachment apparatus and tooth supporting tissues, resulting in tooth loss. Periodontal treatment aims to stop the progression of periodontal disease while also regenerating periodontal tissues that have been lost due to periodontal disease. Periodontal regeneration appears to occur after treatment with autogenous bone grafts, according to data from clinical and histological research. Because it contains cells that engage in osteogenesis, autogenous bone possesses osteogenic potential. Autografts are also bioabsorbable (they are eventually replaced by the patient's own bone), nonallergenic (they produce little tissue reaction without an immunological reaction), simple to utilize, and inexpensive. Around autogenous bone graft particles, rapid revascularization occurs, and the graft can release growth and differentiation agents. When compared to open flap debridement, autogenous cancellous bone from the jaw is not suited for repairing intrabony periodontal abnormalities. An autogenous cortical bone (ACB) graft derived from the surgical site close to the intraosseous defect is beneficial because it eliminates the requirement for a second surgical site for repairing intraosseous periodontal deficiencies. For tissue regeneration, many therapeutic techniques are employed. Various grafting materials, such as autografts, allografts, xenografts, and alloplasts, have been used and therapeutically utilized among them. A case report on periodontal regeneration employing autogenous bone in the treatment of a periodontal intra-bony defect in the lower left molars is presented in this study.