What to do if a root canal treatment is failing

The revision of a previous root canal treatment is necessary if the tooth is noticeable by recurrent dull and sometimes also severe pain and it comes to a new inflammation. Often the patient also has the feeling “something is not right”. Frequently, however, the diseased tooth causes no discomfort and the re-inflammation is only visible on the X-ray image in the form of a dark point at the apex of the root.