Bilateral symmetry of denture, masseter muscle, TMJ and jawmovement.
咀嚼肌、颞下颌关节、下颌运动左右对称。
2
Human skull is usually composed by 29 bones. Besides jaw, other bone between seam by bone connected, the only allowed the traces of the movement.
人类颅骨通常由29块骨头组成。除了下颌骨，其他骨头之间由骨缝连接，只允许微量的运动。
3
Lower lip movement under the gums to do reveal like action then you can feel the neck muscle tension lack of strength when the lower jaw with your fingers Gently press skin to assist the movement.