Abstract: There are provided various appliances for human mandibular advancement. One appliance comprises a frame having a first end adapted to be secured against a fixed part of the body of a subject; a second end equipped with a pulling platform; and an intervening length to present the pulling platform outside the mouth of the subject when the first end is mounted against the fixed part of the body of that subject. At least part of the intervening length of the frame is shaped to match the contours of the subject's face so that when the first end is secured against the fixed part of the body, and at least part of the intervening length lies against the matching contours of the subject's face. Other aspects include a dental device, method for advancing the mandible of a human subject, a shell, and a method for personalising the frame from a blank frame using the shell.