The invention relates to a hairdressing appliance (1) for hair shaping, the appliance (1) comprising first and second jaws (2, 3) opposite each other; a first treatment surface (4) carried by the first jaw (2) and a second treatment surface (5) carried by the second jaw (3), the surfaces (4, 5) used for clamping dreadlocks, at least one of the surfaces (4, 5) being heated and the jaws being connected to be capable of moving from an opening position to a closing position; a component group comprising at least one of a fluid flow adjusting mechanism (6), a fluid evaporation mechanism (7), a temperature detection mechanism (10), an ion emission mechanism (11) and a fluid blocking mechanism (12); a control unit (13) used for controlling at least one mechanism in the component group. The appliance comprises magnetic detection mechanisms (14, 18) used for detecting the movement to the opening position and/or to the closing position. The control unit is programmed to receive a movement representing signal from the magnetic detection mechanisms (14, 18) and control at least one component in response to the signal.