The process is actually fairly painless, Unfortunately, sometimes a tooth does not heal properly after it has been cleaned out, and re-treatment becomes necessary.
What Causes a Root Canal to Fail?
Root canal failure can occur months and even years after the original procedure. Failure can be attributed to a number of conditions:
Essentially, the failure is due to one of three things; either the original procedure failed to remove all of the infected tissue, something prevented proper healing, or a successfully treated tooth has become infected once again.
What Is Endodontic Retreatment?
New pain or visible cracks in the tooth can indicate a failed root canal. However, with the right treatment, the tooth can still be saved. If retreatment is an option: