Most people chew things with the teeth on the left and right sides, or alternate between the left and right sides. This not only can give full play to the chewing function of all teeth, but also can use food and saliva to rub and scour the tooth surface and play the role of self-cleaning to prevent tooth decay, and also has physiological stimulation to jaw bone and muscles, which is especially important to teenagers in the period of growth and development. However, some adolescents are often accustomed to chew with only one side of the teeth, while the other side of the teeth is completely abandoned, thus causing various hazards: 1, malocclusion and disorder of occlusion: due to the repeated movement of the mandibular teeth to the chewing side, the median line of the lower front teeth is misaligned to the chewing side, sometimes the difference can be as much as half a tooth, so that the back teeth form an edge-to-edge, tip-to-tip occlusion, or even a backbite (lower teeth (the lower teeth are wrapped around the upper teeth). 2, facial development asymmetry: for adolescents, the face and jaws are in a period of vigorous growth and development, always fixed with one side of chewing, because the chewing side is often exercised to promote the development of the jaws and muscles, so the side is full of tissue; and often do not use or use the side due to lack of exercise so that facial tissue development is poor, atrophy becomes smaller, resulting in the cranial development of the left and right asymmetry, one side The face is big on one side and small on the other side. 3, prone to dental caries and gingivitis: due to the long-term lack of food friction on the teeth on the side of waste chewing, a large amount of tartar and tartar will accumulate on the surface of the crown and between the teeth and teeth, which will easily lead to dental caries and gingivitis and periarthritis. 4, temporomandibular joint disease: long-term lateral chewing makes the chewing side of the joint movement too much, the burden increases, and leads to the temporomandibular joint in the open and shut popping and accompanied by pain and other symptoms. Lateral chewing is mostly seen in adolescents. There are many reasons for this, but the common reason is that the side that is used is suffering from tooth decay, missing teeth and food embedment, so due to the pain, tooth blockage and inconvenience of chewing, the side is not used consciously at first, and after a long time, it becomes a habit and forms the extremely harmful lateral chewing. Once the serious consequences such as facial asymmetry are caused by lateral chewing, it is very difficult to correct it. Therefore, it is important to remove the cause of the disease. For example, it is important to maintain good oral hygiene, go to the hospital for dental checkups every six months, and treat dental diseases in a timely manner. If there are missing teeth, appropriate measures should be taken or dentures should be placed. In short, after the cause of lateral chewing is removed, you should insist on chewing with the teeth on the left and right sides. If the facial asymmetry is not serious and you are not too old, the deformity will gradually disappear in the future.