Crooked teeth may be caused by temporary physiological phenomenon, retained milk teeth, abnormal development of upper and lower jaw bones, etc. Depending on the situation, we can choose dietary adjustment, extraction of milk teeth, orthodontics and so on. 1. Dietary adjustments: Due to the small size of the milk teeth, the permanent teeth just replaced may have a temporary occlusal bias on the lip side or tongue side, this is a temporary physiological phenomenon, eat more hard food to promote the development of the jawbone, the permanent teeth will gradually move to the normal position. 2. Extraction of milk teeth: The stagnation of milk teeth leads to the lack of sufficient position for the eruption of permanent teeth, resulting in the growth of permanent teeth crooked, in which case the milk teeth will be extracted, and the permanent teeth will be gradually restored to their normal position. 3. Orthodontics: After the complete replacement of milk teeth, the teeth are still crooked, in this case, it is best to seek medical treatment, orthodontics, so that the teeth return to their normal position. Children with crooked teeth should go to the hospital in time, and after clarifying the cause of the disease, they should be treated positively to avoid delaying the disease.