A method (300) for determining an orientation of a user's head with an oral care device (10), the method including the steps of: (i) providing (310) an oral care device comprising a device head (16), a sensor (28), and a controller (30)； (ii) determining (320) when the device head is located within a calibration area (110) within the user's oral cavity (200)； and (iii) estimating (330), by the controller based on an orientation of the device head within the calibration area, an orientation of the user's head.
