The best time to correct a child with crooked incisors is between the ages of 4 and 5. Depending on the age of the patient and the type of malocclusion, the exact time cannot be generalized. First of all, during the age of 4-5 years old, the child is in the period of the growth of the baby teeth. During this period, children’s skeletal system is still growing and developing, so receiving orthodontic treatment as early as possible is not only more conducive to the orthodontic treatment of malocclusion, but also can prevent the occurrence of bad habits such as tongue spitting, lip biting and finger biting due to the malformation of jaw bone development. In addition, when children enter this age group, they are more obedient and cooperative, so they can better cooperate with daily treatment and care to ensure the effect of orthodontic treatment. However, the best time for orthodontic treatment is between the ages of 12 and 14 years old for patients who have already entered the permanent phase. This is when the child’s skeletal tissues are basically set and the dental films allow for better observation of the deformity and a more appropriate treatment plan. During orthodontic treatment, patients should reduce hard and highly viscous foods and pay attention to daily oral hygiene care to avoid other oral system diseases.