An apparatus for determining a body portion of a user treated by the user using a personal hygienic device. The apparatus includes a camera configured to capture the user to obtain a pictorial representation of the user while treating the body portion using the personal hygienic device； an interface configured to receive sensor data from at least one inertial sensor residing in the personal hygienic device； and an analyzer configured to analyze the pictorial representation and the sensor data to determine the body portion.
