From the perspective of human evolution, because increasingly sophisticated modern food, for teeth function more and more low, so people's teeth is a progressive deterioration of the organ, the same reasons human mandible and chewing muscles are degraded. We can see that the primitive and orangutan mandible is particularly large, the mouth is very protrusion, which can prove that we are now the situation.
   However, in the process of degradation, the rate of bone degradation is fast, the teeth are much slower, the result is that the bones of the upper and lower jaws of the modern people are already very small and the upper and lower teeth are as much as the primitive people. As a result, bones can not accommodate so many teeth, it will cause wisdom teeth problems, so that wisdom teeth for modern people, is a degeneration should be a useless organs.
   Most people's wisdom teeth, even if the normal eruption, but also to 17-18 years of age, and the completion of the correction time is generally 14-15 years old, after the completion of correction, the presence of wisdom teeth and growth eruption will have been aligned dentition bad effect, resulting in irregular teeth re-emergence. Moreover, if the wisdom teeth because the space is not enough normal eruption, it will induce wisdom teeth pericoronitis and other issues, is a risk factor in the mouth. Therefore, orthodontist doctors often recommend or ask patients to remove wisdom teeth, which is conducive to corrective effect of maintaining and oral health.

• What's the harm＂front teeth protrusion＂ were not corrected
• Why do patients need full cooperation during the correction?