Endodontic Retreatment
When a prior root canal doesn't heal, retreatment can save the tooth again.
Most root canals last for many years, but occasionally a treated tooth doesn't fully heal, or it becomes painful or infected again months or even years later. This can happen when a canal was especially narrow or curved, when new decay or a cracked filling lets bacteria back in, or when a hidden canal was not treated the first time.
Retreatment gives the tooth a second chance. We carefully reopen the tooth, remove the previous filling material, and use magnification and 3D imaging to find anything that was missed. The canals are cleaned and disinfected again, then resealed. For many patients, retreatment means keeping a natural tooth that would otherwise have to be removed.
Signs you may need this
If any of these sound familiar, it's worth having the tooth evaluated. Early care usually means a simpler, more comfortable result.
Why see an endodontist for this
Retreatment is harder than a first root canal, and it is one of the clearest reasons to see a specialist. The tooth has to be reopened, old filling material and sometimes a post removed without damaging the root, and whatever the first treatment missed has to be found.
Finding it is the whole job. A missed canal is often the size of a pencil tip and hidden under a shelf of dentine, which is why it was missed the first time. Under a microscope, with a 3D scan showing where to look, it becomes visible.
We will also tell you honestly when retreatment is not the right answer. Some teeth are better served by microsurgery, and a few are past saving. You will get a straight assessment either way.
What this treatment does for you
Avoids extraction
Preserves a natural tooth that would otherwise need to be removed and replaced.
Resolves reinfection
Clears lingering infection, including canals missed or reinfected after the first treatment.
Finds what was missed
Microscopes and 3D imaging reveal complex, narrow, or extra canals the first treatment couldn't.
Your visit, step by step
Review & imaging
We examine the tooth and take 3D images to understand why the first treatment didn't fully heal.
Reopen the tooth
The crown or filling and the previous root canal material are carefully removed.
Re-clean & disinfect
Every canal, including any that were missed, is located, cleaned, and disinfected under the microscope.
Reseal & restore
The canals are resealed and the tooth is closed, then restored by your dentist to protect it.
What we use, and why it matters
The equipment is the reason modern endodontics looks nothing like its reputation.
Surgical operating microscope
The single most important tool in retreatment, used to locate canals and hairline cracks the first treatment could not see.
Cone beam 3D imaging
Shows untreated canals, the true extent of infection, and root fractures that never appear on a standard x-ray.
Ultrasonic instruments
Fine tips that remove old filling material, posts, and calcified blockages with control rather than force.
Specialised retreatment files
Instruments designed specifically to soften and withdraw previous root filling material.
What happens afterwards, and when
A realistic timeline so you know what is normal and what is worth a phone call.
Same day
Numbness fades over a few hours. Normal activity is fine; go easy on that side.
Days 1 to 4
Soreness is common and typically a little more noticeable than after a first root canal, because more work was done. It settles.
Weeks 1 to 2
Symptoms should be clearly improving. Tell us if anything is getting worse rather than better.
Weeks 2 to 6
Your dentist places the final restoration once we confirm the tooth is comfortable.
6 to 12 months
A review x-ray confirms the bone at the root tip is filling back in, which is how we know it worked.
Aftercare & healing
A few simple steps help you heal comfortably and protect the result. We send you home with clear instructions and stay reachable if you have questions.
- Expect mild soreness for a few days that eases with over-the-counter pain relief.
- Chew on the other side until your dentist places the final restoration.
- Attend any follow-up so we can confirm the tooth is healing as expected.
What happens if it is left
A previously treated tooth that has become symptomatic again is telling you bacteria are back inside it. Waiting rarely improves the odds.
- Infection continues to erode the bone around the root tip, which narrows the options later.
- A flare-up into acute pain or facial swelling can happen at any time, usually inconveniently.
- Continued bone loss can make the tooth too compromised to retreat at all.
- What could have been a retreatment becomes an extraction, plus the cost of replacing the tooth.
Cost & insurance
Retreatment generally costs more than an initial root canal because it takes longer and involves removing the previous work before the tooth can be cleaned again.
Coverage varies by plan, and some plans treat retreatment differently from a first root canal. We check the specifics with your insurer and put the estimate in writing before you decide.
The comparison that matters is retreatment against extraction plus an implant or bridge. Keeping your own tooth is usually the less expensive path and always the more natural one.
We go through the estimate and your coverage with you before treatment starts, not after. If the number is a problem, say so and we will talk about options.
Ask about costCommon questions
New decay, a cracked or leaking restoration, or narrow and curved canals can allow bacteria back into a tooth that was treated before. Sometimes an extra canal was simply hidden the first time.
When a tooth is restorable, keeping it is usually the best option. We give you an honest assessment and will tell you if an implant or other option would serve you better.
Retreatment has a high success rate, especially with the magnification and imaging we use to find what a first treatment may have missed.
No. Retreatment is done with the same thorough numbing and is typically no more uncomfortable than the original treatment.
If a conventional retreatment can't resolve the problem, a small procedure called an apicoectomy may still save the tooth. We'll walk you through the options.
In pain, or not sure if you need endodontic retreatment?
Request a visit and our team will help you figure out the next step. No referral needed to be seen.