There are methods for the signalling of a faulty pattern of use of an electric toothbrush to a user, wherein the electric toothbrush comprises a drive shaft for coupling to a brush part, an electric motor and a drive for providing a first motion and a second motion of the drive shaft, wherein the drive is arranged such that the second motion is interrupted when a predetermined contact pressure is exceeded. This state is signalled to the user by activating an electric switch connected to a warning light. It is thus an object of the present invention to provide a method and a toothbrush allowing a simplified determination of a pattern of use of an electric toothbrush. This may be achieved by modification of the above method such that it contains the steps: measuring a characteristic parameter of the electric motor, detecting a distinctive change of the characteristic parameter, and evaluating the distinctive change.
