Whether or not the wisdom teeth above need to be extracted depends specifically on the oral hygiene and the growth of the teeth, and extraction is recommended for teeth with no occlusal relationship and poor growth position. Due to chewing is too fine, jawbone growth length usually can not accommodate the growth of wisdom teeth, but wisdom teeth often appear obstruction, can appear forward compression of neighboring teeth roots, by the upper bone tissue and soft tissue resistance caused by wisdom teeth pericoronitis and other cases, or the opposite jaw teeth have no occlusal relationship, oral hygiene conditions are poor, it is recommended to remove wisdom teeth as soon as possible to avoid wisdom teeth inflammation. However, if the growth position of wisdom teeth is more positive, and has been fully grown out, and there is an occlusal relationship with the opposing teeth, and the oral hygiene conditions are good, the wisdom teeth can be retained to provide part of the chewing function.