First, let's answer the first question. There is no age limit for orthodontics, and adults can correct it. The premise is periodontal health, such as periodontitis, dental caries, temporomandibular joint disease and so on. You should cure the oral problems before you correct them. But due to the end of development, adults may have a longer correction process than children.

Secondly, it depends on whether the tooth is extracted. Tooth extraction is just one of the means to correct teeth. Not everyone needs to have their teeth extracted. Tooth extraction needs to be decided according to the actual situation of the patient, such as the degree of tooth crowding, alveolar bone mass, protrusion and so on. Therefore, to do orthodontics, you must go through the examination of a professional orthodontist, and you can decide whether to extract teeth through X-rays, panoramic fragments and other auxiliary devices. However, I heard that there is a kind of invisible braces called Zhengya GS on the market now, which seems to be able to do more complicated correction without tooth extraction.

It is rumored that after orthodontics, the teeth move, the bones between the teeth loosen and the teeth fall off easily. In fact, the principle of orthodontics is to use the physiological bone absorption and deposition of alveolar bone after orthodontic force to achieve the purpose of moving teeth. After correction, it is necessary to wear a retainer for a period of time to achieve the stability of alveolar bone and facial muscles. The stability of teeth after correction may be better than that before correction, because the unstable contact surface in irregular dentition is removed and the occlusal relationship is improved.