It is an object of the present invention to provide a dental instrument comprising a drill head (52) connected to a handle, wherein the drill head has an underside and is configured to be inserted into a patients mouth. A dental bur (20) extends from the underside of the drill head and has a long axis. An imaging device (25, 55) comprising optical components for capturing and processing an image of a drilling treatment area is incorporated in the drill head and has an optical window (53, 82) directly adjacent to the dental bur on the underside of the drill head to minimize an angle between an optical line-of-sight of the imaging device and said long axis of the bur. It has also been discovered that incorporating all optical components in the dental instrument allows for greater flexibility and manoeuvring of an imaging device.
