An oral care system is disclosed. The oral care system includes an electric toothbrush having an energy source； an electronic circuit including a microcontroller and one or more electric loads； and at least one sensor for providing a signal indicating a relevant change of an external condition； and a mobile computing device that stores a computer application. In response to a relevant change in an external condition, the signal has an energy content allowing the microcontroller to activate a ready mode, the ready mode causing the system to perform at least the following prior to turning the toothbrush on: switching on one or more of the electric loads for a preset period； enabling a wireless communication link between toothbrush and device； and exchanging data between toothbrush and device as part of the wireless communication.
