Abstract: The present application relates to a system (10) for treating a part of a body to be treated. The system comprises a hand-held treating device (20),and a position identifier (30, 150) configured to generate information indicative of the position of the treating device (20) relative to the part of the body to be treated. A controller (40) is configured to determine a path and/or angle of orientation of the treating device (20) relative to the part of the body to be treated in dependence of the information generated by the position identifier (30, 150). The controller (40) is also configured to operate a feedback module (120, 130, 160) to provide feedback to a user based on the path and/or angle of orientation of the treating device (20) determined by the controller (40). The present application also relates to a treating device configured to be used in a system as described above and a method for treating a part of a body to be treated.