You did everything right. You had the root canal, you got the crown, and for a while the tooth felt fine. Then the ache came back. For Manhattan patients facing a failed root canal, retreatment at our Flatiron District office is usually the path that saves the tooth, and it is one of the procedures our endodontists are most specifically trained to perform.

Why do some root canals fail? The most common culprits are anatomical. Molars in particular can hide extra canals, unusually curved roots, and microscopic branches that earlier treatment, especially treatment done without an operating microscope, never reached. Infected tissue left in those spaces keeps the problem alive. Failure can also come from above: a delayed or leaking crown, new decay at the margin, or a crack that lets bacteria back into the sealed canal system.

Signs that a treated tooth is in trouble include returning pain, tenderness when chewing, gum swelling near the tooth, or a small bump on the gum that comes and goes. Some failures are silent and show up only as a dark spot at the root tip on an X ray. In every case, the finding means active infection, and active infection near the bone is worth taking seriously.

What can you expect during retreatment at our Manhattan office?

Retreatment begins with detective work. At 37 West 17th Street, we use high resolution imaging and dental operating microscopes to establish exactly why the original treatment failed before we commit to a plan. This diagnostic step matters, because if the tooth cannot be predictably saved, we will tell you honestly rather than treat it anyway. No selling is one of the founding principles of our practice.

When retreatment is the right call, we reopen the tooth, remove the old root canal filling, locate the missed or reinfected anatomy under magnification, and thoroughly disinfect and reseal the entire canal system. You are numb and comfortable throughout, and most patients describe the appointment as no more eventful than the original procedure.

Afterward, mild soreness for a few days is normal and manageable with over the counter medication. We coordinate with your general dentist on the timing of your new permanent restoration, since placing it promptly is critical to keeping bacteria out for good.