In fact, professional orthodontists choose whether to extract teeth and which teeth to extract after a careful choice made by systematic analysis (models, radiographs, photographs, etc.). The choice of extraction has its professional principles: no extraction as much as possible, marginal cases can be corrected first and then evaluated in treatment; try to extract bad teeth and the least important teeth in terms of function and aesthetics; symmetrical extraction to avoid midline and malocclusion. Routinely, incisors will not be extracted (considering aesthetics) and cuspids will not be extracted, otherwise the facial aesthetics will be affected by the collapse of the corners of the mouth. The first molar (the most powerful chewing function) will not be extracted. It is not the case that many patients imagine that whichever is the most crooked will be extracted!