Osteonecrosis of the jaw is an important but uncommon side effect of bisphosphonate therapy. It may result in disabling and sometimes disfiguring complications that may affect the quality of life of patients. It occurs more frequently in patients on intravenous nitrogen-containing forms of bisphosphonates and is thought to be time and dose dependent. Currently, there is no recognized effective treatment apart from controlling pain and accompanied infection. Prevention of this complication is therefore important. In this article, some of the key issues of bisphosphonate-associated osteonecrosis of jaw are being reviewed.