An imaging device for dental treatment for use in an instrument for dental treatment with a head to which a rotary cutting tool can be attached. The imaging device for dental treatment comprises: an imaging module with an imaging element and a mounting section through which the imaging module is detachably attached to the instrument for dental treatment such that the imaging module is on the bottom side or on the lateral side of the head, and that the imaging module is in a posture that causes the imaging axis of the imaging module and the rotary axis of the rotary cutting tool to be substantially parallel.
