The aim of this study was to present the case of a 68-year-old female patient with jaw bone necrosis associated with the use of bisphosphonates. The case was qualified for the second degree of severity (BRONJ). The study demonstrates a multi-month observation of the patient and describes the sequestrectomy procedure performed, which was supplemented by covering the bone tissue with a collagen sponge. The treatment applied was slightly different from the accepted algorithms of proceedings. The difference was connected with the use of a collagen sponge containing gentamicin (used to cover the bone's surface) after the sequestrectomy. The collagen material, in contrast to the exposed dead bone, is a surface which may be susceptible to epithelization. This gives a possibility to the secondary closing of the wound as a result of granulation and epithelization without the bone's re-exposure. Moreover, the study characterizes indications for the use of bisphosphonates, their chemical structure and mechanism of action. It shows the definition of BRONJ (bisphosphonate-related osteonecrosis of the jaw) and risk factors for its occurrence, as well as prevention and treatment methods.