Abstract: A toothbrush training system for children includes an instrumented toothbrush with physics sensors, along with optional feedback elements, interacting with a dynamic audio-visual instructional program providing guidance, assessment and feedback on proper brushing procedures. The system provides instruction on tooth brushing technique in combination with monitoring and corrective feedback based on that technique in the context of an audio-visual game environment. The instructional program uses an animated character to illustrate the desired toothbrush positioning and movement for cleaning specific tooth surfaces. The content and progress of the audio-visual presentation may be dynamically altered based on data received from the toothbrush to adjust the presentation in response to a comparison of the instructional information and the actual tooth brushing movement performed by the user.