<p>Modulation of bone turnover by antiresorptive agents impairs wound healing of jaw bones, and can result in an adverse event termed medication-related osteonecrosis of the jaw (MRONJ). In recent years, the prevalence, risk factors, and prevention strategies for MRONJ have been extensively investigated, but only few studies have focused on its treatment outcome, and the proposed prognostic factors have varied greatly. We systematically reviewed the prognostic factors in patients undergoing treatment for MRONJ. In total, 33 studies met the inclusion criteria out of 1,388 screened citations. For analysis, we grouped the prognostic factors into five categories as follows: medication-related, underlying conditions, lesion-related, serum markers, and treatment modalities. Discontinuation of antiresorptive therapy was a medication-related factor significantly associated with better treatment outcomes. Regarding underlying conditions, malignancy, especially multiple myeloma, was associated with worse treatment outcomes. Among lesion-related factors, better treatment outcome was noted for maxillary lesions and lesions with sequestrum formation. By contrast, lesions of advanced stages and those with periosteal reaction had poor treatment outcomes. Regarding treatment modality, surgical therapy was associated with a better chance of healing. Results of our meta-analysis helped identify prognostic indicators of MRONJ and will assist in decision-making in the clinical setting. Based on our results, surgeons may have a better cognitive context to discuss treatment options with patients. Additionally, our findings provide convincing evidence for physicians to consider postponing antiresorptive therapy in patients with MRONJ lesions.</p>