Root canal retreatment: when a tooth can still be saved

Hearing "this tooth has to come out" is not always the final verdict. Some of those teeth can be kept through root canal retreatment.

Retreatment is for a tooth whose canal was treated before but the problem came back: pain, inflammation at the root tip, or changes visible on an X-ray. The dentist removes the old filling material, finds the cause and seals the canal again.

Why the first treatment failed

• the canal was not negotiated to full length or was not sealed tightly
• an additional canal was missed — anatomy differs from person to person
• a fragment of an instrument was left inside
• the crown or filling lost its seal over time and infection returned

What the microscope adds

Much of the above cannot be seen with the naked eye. Under magnification the dentist finds the openings of narrow canals, assesses the walls and spots a crack that genuinely makes treatment pointless. More often than not it is the microscope that turns a "hopeless" tooth into a treatable one — or honestly closes the question.

When keeping the tooth is not worth it

If the root has a vertical fracture, if the damage extends deep under the gum with nothing left to build on, if there is almost no bone around the root — retreatment only postpones the inevitable. In that situation planning an implant straight away makes more sense.

In borderline cases we do not decide alone: the images are discussed with the clinic’s surgeons and prosthodontists, and together we choose what will serve the patient longer — the natural tooth or an implant.