The maxillary first molar is one of the earliest erupted permanent teeth, the anatomy is more complicated, the function is more important, and it is the key to cooperation. Therefore, we should focus on protecting and cherishing her, after eruption, we can do sulcus closure to prevent caries, brush teeth diligently, eat less sugary diet, review regularly to see the dentist, don’t let her bad, bad in time to make up for the pain, once the pain is also the pulp inflammation, the dental nerve can’t stay, to do root canal treatment, also must go to the regular outpatient or hospital; don’t want to be cheap, save trouble, casually regardless to that look at the matter, unfortunately Sometimes there is no certain ability of the doctor to see the teeth not only look bad, but also destroy the original normal anatomical structure, and then change the good doctor to see may not be able to see, then the power of return, tooth extraction is sometimes unavoidable, a green environmental protection by the parents have an important The baby with an important mission is going to be laid off in advance. With the development of the discipline and technology, awareness continues to improve and some things have to be reacquainted, as is the case with root canal treatment of the maxillary first molar. In the past, most people thought that finding three root canals in this tooth was considered to be a good job, but nowadays it is not. In clinical practice, the possibility of four root canals in this tooth is very high. In clinical practice, the possibility of four root canals in this tooth is very high. If root canal treatment is done, the chance of MB2 is 60%, and if your treating doctor does not have this ability, treatment failure is inevitable. MB2 is the first molar near the middle root double root canal means, that is, near the root of the small teeth in front of the two root canals are very close, that is, 60% of the tooth is four root canals, if you do not find the tooth missed treatment failure is inevitable. Some teeth are simple and can be seen nearby, some teeth are extremely complex and cannot be seen casually, the first molar of the upper jaw is such that it is not possible to save time, if you have something wrong with this tooth to be careful, to see also to keep an eye on.