I don’t know what it means when “the earth covers the sky and the sky enlarges the jaw”? Dibaotian can be divided into dental and skeletal types, and usually manifests itself as: a warped chin and deflated lips. People with bony protrusions have long mandibles. If the mandibular angle is too large, they will be suspected of having enlarged jaws (we do see such people in society). If you are born with a small mandibular angle, you will not become enlarged.