The teeth of the sky is actually not in need of correction, as seen in nature, must be the sky wrapped around the ground, which belongs to the normal; if the ground is wrapped around the sky is abnormal, only then need to be corrected, so the ground once found need to be corrected in a timely manner, whether it is the period of milk teeth or permanent teeth, should be corrected as soon as possible, but the sky wrapped around the ground belongs to the normal situation, do not need to do orthodontics. In the range of the sky, if there are uneven teeth, twisted teeth, misalignment, abnormal bite relationship, this situation also needs to go to correction, correction methods can be through functional orthodontics, through the movable braces or fixed braces, such as wearing brackets, can also be corrected through the invisible orthodontic methods.