Treatment principles of paediatric mandibular fractures may differ from the treatment of the adult population in that a conservative approach is in most cases advocated before the use of internal rigid fixation with plates and screws. This is because of a relative high risk of disturbed facial skeletal growth and risk of damaging unerupted teeth. Knowledge of conservative treatment options is essential in order to minimize these risks and one option is presented in this paper. This case report describes a 5-year-old girl that sustained an open fracture of the mandible and who was successfully treated by the means of applying orthodontic brackets and an arch bar combined with ligatures and rubber elastics.