I Deciduous tooth stage (4-5 years old): This stage is mainly suitable for crossbite of deciduous teeth. Early correction is beneficial to maxillary development and prevents crossbite of permanent teeth. If the child has bad habits such as tongue sticking out and lip biting, they can be corrected at this stage to prevent the occurrence of malocclusion.

II Teeth replacement stage (girls: 8-10 years old, boys: 9-12 years old): During the tooth replacement stage, if the child is found to have bad habits such as biting the lip, sticking out the tongue, and protruding the mandible, and If you have abnormal facial shape or tooth arrangement, you should promptly go to the hospital to see an orthodontic professional for examination to determine whether the malocclusion is dental, functional or skeletal, and to clarify the treatment plan.

III Permanent tooth stage (girls: 11-14 years old, boys: 13-15 years old): At this time, the child’s teeth have been replaced and the bones are basically finalized. Common malocclusions occur in this stage. All stages can be treated well.