Whether tooth protrusion needs to be extracted varies from person to person and depends on the degree of protrusion, as follows: 1, particularly mild protrusion can be achieved without tooth extraction, and the effect of protrusion can be solved by some technical means such as tooth reduction, distant and medium mobile grinding or arch expansion; 2, most tooth protrusion still needs to be extracted because the degree of protrusion is still slightly larger in most patients, and through tooth reduction, pushing grinding and arch expansion. The amount of inward retraction of the teeth will be relatively much smaller, but the degree of improvement is not great. Usually, it is necessary to obtain a gap through tooth extraction and use the gap to retract the anterior teeth in order to obtain a better treatment result.