Generally speaking, the land will get worse with age. If not corrected in time, it may affect the development of maxillofacial bones and limit the normal growth of maxilla. If the child obviously misses the opportunity in the process of growth and development, it may cause serious injury. From the side, it looks like a crescent face. In the later stage, a vicious circle may occur, resulting in a significant difference in the development speed of the upper and lower jaws, resulting in the teeth not having normal occlusion function for a long time.

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