If your child’s teeth are crooked, you don’t need to worry about it until the permanent teeth are absolutely in place, but if they are crooked after the permanent teeth have grown in, you can have them straightened. Children’s milk teeth will be gradually replaced by permanent teeth, the time is about 6 ~ 12 years old stage. Crookedness of the permanent teeth at the stage of eruption is generally a normal phenomenon, as the permanent teeth are not yet fully positioned at this time. After the eruption of the permanent teeth, the teeth and lips will be squeezed each other, which will help the permanent teeth to be adjusted to the correct position, usually before the age of 12 years, the permanent teeth will complete the final positioning. If the teeth are still crooked even after the permanent teeth have been positioned, it means that the teeth have not been positioned correctly, and it is necessary to go to the dentist in the hospital to have the teeth corrected by wearing braces. In order to avoid crooked teeth, parents should pay attention to the health of their children’s milk teeth during the period of tooth loss, because the quality of milk teeth affects the quality of permanent teeth. Therefore, parents should remind their children to do a good job of oral hygiene, and do a good job of dental and oral hygiene after meals.