Now talk about anti-union. Contradictions can be roughly divided into two types, true and false. Generally hereditary, it can also be said to be bony, which is caused by the imbalance between the upper and lower jaws determined by genes. If it is not particularly serious as a child, you can correct it first and solve the aesthetic and functional problems first. However, this kind of malocclusion is very likely to recur, which is often more serious than parents. Adult needs surgical correction, that is, orthognathic orthodontics combined treatment. The other is called false inversion or functional inversion. It is generally caused by bad habits, such as improper breastfeeding methods, sucking fingers, imitating the sky and so on. ~ this situation should be dealt with as soon as possible, and it is more likely to be corrected. If the best opportunity is delayed, the fake will become true. In short, children can try functional correction early and prepare for recurrence in the future! Primary teeth need early treatment (before 6 years old). Generally speaking, there are fewer back bites. If there is a reaction, it is not a bone, but a simple tooth reaction. Therefore, simple padded tongue spring appliance or mandibular crown oblique guide plate can be used for treatment, and teeth can be broken. Early correction can remove the restriction of mandible on maxillary development and prevent children from feeling inferior or other psychological development obstacles due to crossbite. In the early stage of tooth replacement (about 8 years old), you can take a film to see the development of maxilla and mandible. If there is no bone problem, a simple fixed appliance can be used to make the front teeth develop labially. If there is maxillary hypoplasia, it is necessary to do maxillary protraction and pull out the retracted maxilla.