Recurrent mandibular dislocation is a relatively rare but very unpleasant disease. Usually the patient initially dislocates the mandible when yawning or during dental treatment and is then no longer able to close his mouth. The doctor then has to reposition the mandible. If this occurs again and again, a small arthroscopic operation can prevent further dislocation. This involves contouring the bone of the articular eminence with a micro reamer so that the condyle is no longer able to lock in front of the articular eminence.