Therapeutic activites can lead to major accidents and complications, because of mistreatment and non-cooperative patients. The paper presents a 24 year old patient, with lost teeth 1.2., 2.2., and purulent secretion of the periodontal space, distal of 1.1. at pressure in the vestible and mobility of unknown ethiology. With clinical and radiological examination we could not have an ethiological diagnosis, so we decided to have a surgery. During the procedure we found a lot of foreign objects in the upper jaw, around the rooths of teeths 1.1. and 2.1. (four elastic orthodontic rings).