After the second molar is extracted, if it is not repaired in time, there are effects. First of all, it is easy to cause the elongation of the teeth in the opposite jaw, and when the teeth in the opposite jaw are elongated, a gap will be formed between them and the neighboring teeth, which is especially easy to cause food embedment, and also easy to cause the caries on the adjacent surface of the teeth. At this time, if the decay is not detected in time, the nerve leakage of the adjacent teeth will occur, and the first molar will be prone to root canal treatment and may need porcelain braces to repair. In addition, there may be a large area of decay that cannot be repaired, and the relevant teeth need to be extracted, so that the number of missing teeth will be more and more, and if the second molar is extracted with impact, if necessary, the second molar is extracted and needs to be repaired in time, in order to avoid the subsequent reaction.