Proliferative malocclusion is a transient, abnormal type of occlusion of the teeth during tooth replacement: 1, a gap in the front and middle with an external octagon; 2, two lateral incisors developing outward; 3, a slight crowding of the teeth; 4, a sixth tooth with a cusp-to-tip abnormal occlusal relationship. Mild malocclusion during the teething period does not require orthodontic treatment without stress. Because of the slight crowding, it may improve with age, because children’s teeth will not change in their lifetime. But the face and bones have to grow, so it’s not straight now, but it may be in a couple of years. In addition, there is a gap between these two, and this kind of ectopia should be checked at the hospital, first of all, to rule out whether there are extra teeth in the middle, if there are extra teeth in the middle, you need to do treatment in time. If there is no extra tooth in the middle, it can be left untreated, and then the tooth can be improved by growing forward. So minor temporary malocclusion during the teething period, do not be nervous to do orthodontic treatment.