The present disclosure is concerned with a personal grooming appliance, in particular an electric toothbrush or an electric personal grooming or personal hygiene device, that has an energy source, an electronic circuit comprising at least one electric load, a first sensor for providing a first signal indicating a relevant change of a first external condition, and wherein the personal grooming appliance is arranged to stay in a sleep mode in which the electronic circuit consumes at least a reduced average energy amount in comparison to an active mode and to initiate the active mode when the first signal indicating a change of the first external condition is received. In one embodiment, the electronic circuit is arranged to perform a welcome routine in response to a first active mode initialization and a standard routine different to the welcome routine in response to receiving the first signal indicating a relevant change in the first external condition after the welcome routine has been performed. In another embodiment, the first sensor is a light sensor, a resistance sensor, a humidity sensor, a gas sensor, or a temperature sensor. The present disclosure is also concerned with a personal grooming appliance unit comprising such a personal grooming appliance and a packaging at least partly housing the personal grooming appliance, wherein the first sensor is sensitive to a change of the packaging condition, in particular to an opening of the packaging.
