Clinically, there is no definite number or requirement for how many teeth can be extracted at one time, from 1 to more than 10 or 20 teeth can be extracted. However, specific problems need to be analyzed to check the patient’s general condition, tolerance, and the specific situation of the teeth in the mouth. In some cases, due to severe periodontitis, all the teeth in the mouth are 3 degrees loose, and most of the roots are exposed, so there is no value in retaining them. Removal of this type of tooth itself is less traumatic, and most of the patients have more urgent restorative requirements and need to have all the teeth removed as soon as possible after the restoration of the whole mouth. In this case, if the patient’s general condition permits, it is possible to consider removing all of the teeth in the mouth at one time. There is also a basic principle of extraction in clinical practice, which is to extract the teeth by side, for example, before the treatment of subtractive orthodontics, or in the case of bilateral wisdom teeth extraction, the left side of the teeth will usually be extracted first, and then the right side of the teeth will be extracted after waiting for 2 weeks. This is mainly for the purpose of allowing the patient to chew with the other side of the teeth after the extraction of one side of the teeth, which has relatively less impact on the patient’s life.