In recent years, it has been reported that the number of cases of facial trauma due to falls among the elderly has increased. Here we report a case of a super-elderly patient with severe dementia who was able to be discharged soon after being treated with open reduction internal fixation and an interdisciplinary approach. The patient was a 92-year-old woman with severe dementia. She sustained injury as a result of a fall and was brought to our hospital. Upon X-ray examination condyle and mandibular fractures were observed. The patient was admitted on the same day and open reduction internal fixation was performed under general anesthesia. Following the surgery, an interdisciplinary approach including swallowing training, dementia care, and rehabilitation were performed. It is necessary to decide the indication for open treatment of a fracture based not only on the patient’s age but also the eating state before injury. It is also important to set goals at the beginning of hospitalization and to share information and collaborate among professionals with different specialties.