The best age for orthodontics in children is divided into 3 age groups. 1, 3-6 years old during the period of the milk jaws if the milk teeth are not aligned, in serious cases may appear sky or ground, this is a more appropriate time for early orthodontics. 2, 7-13 years old mixed teeth stage, when the teeth are growing faster, prone to bite misalignment, can be appropriate intervention to correct teeth. 3, 13-14 years old during the permanent jaws. This is when all the baby teeth in the mouth of the child has completed replacement, orthodontic effect will be more obvious and more stable. The appropriate age to choose orthodontics, the effect will be more obvious. Parents are advised to take their children to the hospital in time for orthodontic treatment.