A personal hygiene device (100), in particular a toothbrush, having a handle (140), a treatment head (120) mounted for relative movement with respect to the handle (140) against a spring force when a treatment force is applied in at least one direction onto the treatment head (120), a treatment force measurement unit for determining the applied treatment force comprising an electrically powered coil (170), a coil core element (180), and a control circuit (190) for determining a parameter indicative of the inductance of the coil (170), wherein the coil core element (180) is arranged to be moved with respect to the coil (170) when the treatment head (120) is moved.
