The consequences of a root canal failure should be differentiated on a case-by-case basis. If it is caused by normal physiological changes, there are usually no consequences, and if it has been plastically treated in the early stages, it may lead to an inability to perform root canal treatment in the later stages. Root canal is mainly due to the physiological changes of the tooth itself, with the increase of age, there will be calcified material precipitation in the root canal system, this is a kind of ageing change of the tooth, which is more common in middle-aged and old-aged people’s teeth, if the calcification is complete, there is no inflammation, and there is no problem with the long-term observation, it is not necessary to carry on the expansion of the canal, and there will not be any consequences in general. If the root canal is inaccessible because the tooth has had plasticizing treatment, that is, the plasticizing solution is injected into the root canal, so that the plasticizing solution condenses and solidifies in the root canal, and the affected tooth can be preserved, but if the root tip is inflamed and then you want to carry out the root canal treatment, it is difficult for the root canal file to unclog the root canal, and if you over-exert yourself, you may have lateral penetration. However, apical surgery can be performed. Dental root canals are not accessible in time to the regular hospital, to clarify the cause of the disease, under the guidance of the doctor standardized treatment.