According to experts, in the process of orthodontics, molars play a very good role in correcting the shape of teeth. Molar mainly removes the protruding enamel, which does not harm the pulp and gums, so it will not cause harm. In the process of grinding teeth, dental instruments have close contact with oral tissues. If people with insufficient technical experience grind their teeth in some institutions without medical qualifications, it may lead to some problems. For example, unqualified sanitary conditions of oral instruments may lead to cross infection, or problems with dental technical experience may lead to molar damage to gingival tissue and even dental pulp. In a regular stomatological hospital, skilled dentists generally grind their teeth without hurting their teeth. Generally speaking, patients with mild crowding can get limited space by expanding dental arch, and do not need tooth extraction correction; Most patients with moderate and severe congestion should use tooth extraction to obtain clearance; And those malocclusion with protruding front teeth and no gap in dental arch also need to be extracted to get a gap. Orthodontic tooth extraction depends on the doctor's technical level. In general, when orthodontists correct tooth extraction, they prefer diseased teeth and teeth that have the least influence on masticatory function. Maxillary and mandible will be considered as a whole, and there is a detailed design scheme, which can achieve what effect. In addition, for patients who need tooth extraction, their chewing and other functions are generally not affected. Moreover, the occlusal relationship of teeth after correction is better, but the function of teeth is enhanced and more beautiful, and the service life of teeth will be prolonged. Therefore, patients who need tooth extraction and orthodontics do not need to worry too much.