Jaw is a complex bone structure, which is located in the jaw and consists of multiple bones. Jaw plays a very important role, including supporting teeth, chewing and digesting food, speaking and forming facial contours. Jaw is also one of the products of human evolution. After long-term evolution and development, it plays a unique role in human mouth and chewing.

Jaw is a kind of bone structure closely related to teeth, and teeth are connected to jaw through root canals and firmly fixed in them. Jaw plays an important role in supporting teeth, that is, teeth can bear the force of chewing and occlusion and will not fall off easily. Therefore, keeping the jaw healthy is one of the foundations of dental health. Only when the jaw structure is complete and firm can the teeth be protected from wear and damage.

Jaw also plays an important role in human facial contour. Its shape and size directly affect people's five senses, such as the size of cheekbones, even if people's facial lines are full and beautiful. In addition, the distribution of jaws also affects human pronunciation and expression. Therefore, the application of jaw knowledge and technology in plastic surgery and speech therapy has become an important part of the development of modern medicine.