According to a dental image display device, a dental surgical operation device, and a dental image display method, a 2D captured image of a tooth as a surgical operation target that is captured with visible light in an articulation face direction, and an articulation face direction converted 2D image obtained as a result of displaying 3D information, which is acquired on the tooth and includes information on a root canal inside the tooth, two-dimensionally on a predetermined plane in the articulation face direction, are displayed in correspondence with each other on a monitor.