12-15 years old, the ideal stage for orthodontic correction is usually during this period when the patient is at the peak of his development, and the front teeth have been completely replaced. At this time, dental correction can be carried out faster and correct. The actual effect is also smoother. However, for patients with crossbite (underbite), if it is skeletal crossbite, correction and intervention should be started at the age of 4-5, and close follow-up during the tooth replacement and new tooth periods. Even if correction is needed, it will be relatively simple. If initial correction is missed, skeletal crossbite will require orthognathic surgery combined with orthodontic correction when growing up.

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