SMART TOOTHBRUSH

A method of monitoring toothbrushing comprising: a coaching phase in which: a position sensor detects position information of a toothbrush during a first instance of free brushing by the user; one or more additional sensors record movement information of the toothbrush during the first instance of free brushing; a user-specific statistical model is generated which maps the positional information onto the movement information; and a monitoring phase in which: the one or more additional sensors record movement information of the toothbrush during a second instance of free brushing; and the toothbrush compares the movement information received during the second instance of free brushing with the user-specific statistical model to calculate positional information.