Which of the following light sources should be selected when taking oral photos of patients?

Flash. Recently, digital studio flash has been introduced into facial photography of orthodontic patients, aiming at improving the shortcomings of camera body flash in shooting facial images in the past. Although the camera body flash is relatively light and does not occupy space, it is often easy to cause local shadows on the face, especially affecting the beauty of the side. Room light can make up for its defects, so that the patient's face is irradiated by the light directly above, and the light on the face is even and symmetrical, with a harmonious and obvious contrast relationship.