When a Root Canal Fails: Retreatment, and What It Costs
Redoing the treatment is a normal, coded, priced procedure — and on both schedules that list it, it costs more than doing it the first time. Here is what the codes say and what the options are.
Start with the fact that it is priced
The most reassuring thing about a root canal that has not worked is that it is not an unmentionable outcome. It has procedure codes. Two of the three schedules this site reads list them, by tooth position, at published amounts — which means it happens often enough that payers have written down in advance what they will pay for it.
| Tooth | First time | Retreatment | Difference |
|---|---|---|---|
| Montana, molar | $553.28 | $652.08 | $98.80 more |
| Washington DOC, molar | $1,346.40 | $1,494.40 | $148.00 more |
| Montana, front tooth | $403.10 | $434.72 | $31.62 more |
| Washington DOC, front tooth | $978.40 | $1,135.20 | $156.80 more |
Both payers price the second attempt above the first. That is the schedules telling you something true about the work: getting back into a tooth that has already been filled and sealed, taking the old material out, and cleaning canals that somebody has already been down is harder than starting with a fresh tooth.
Pennsylvania's schedule has no retreatment line at all. Its endodontic lines carry a limit printed in its own Limits column — "1 per lifetime" — which is a statement about what that programme funds and not a statement about teeth. Read it as a rule, not a prognosis.
What "failed" actually means
Not that something was done badly, necessarily. A canal can be too narrow or too curved to clean along its whole length. A tooth can have an extra canal that does not show on the X-ray taken at the time. The seal at the top can leak, letting bacteria back in, which is one of the reasons the final restoration is not an optional cosmetic afterthought. A tooth can crack later. New decay can reach the filling.
The American Association of Endodontists' own framing is that this is recoverable: "Often when this occurs, redoing the endodontic procedure or performing endodontic surgery can save the tooth."
The two routes back in
Non-surgical retreatment is the route the codes above describe: the restoration comes off, the old filling material comes out, the canals are cleaned again, and the tooth is refilled and resealed. Then it needs restoring again — and that is the part people forget when comparing the retreatment fee to the original fee. The crown may have to be remade.
Endodontic surgery goes in from the other end. The schedules price it as apicoectomy, meaning the tip of the root is reached through the gum and dealt with there. The spread on that is the widest of anything we read: Pennsylvania allows $70.00 for an apicoectomy on any tooth position, while the Washington endodontic schedule allows $943.20 on an anterior tooth, $1,042.40 on a premolar and $1,165.60 on a molar. Montana sits between them, at $359.63, $414.96 and $462.38, with its lines capped at age 20.
We cannot tell you which route applies, and no schedule can either. That is decided by what the X-ray shows and by whether the tooth can be reached from above at all.
The third option, which is not failure either
Taking the tooth out. Sometimes the answer is that a tooth has been repaired as many times as it can be. That decision brings its own costs and its own consequences for the gap, and we have given it a page of its own rather than a paragraph here — see what keeping a tooth and removing it each cost on the same schedule.
How you would find out
Sometimes pain. Often not. A tooth without its nerve is a poor alarm, and problems under a treated tooth are frequently found on a review X-ray rather than reported by the person who owns the tooth. This is the practical argument for the follow-up appointments, and the reason to be suspicious of your own reasoning when it concludes that a tooth is fine because it is not complaining.
When there are symptoms, the AAE's threshold is the same one it gives for the days straight after treatment: severe pain or pressure, or pain lasting more than a few days, means ring. A pimple on the gum near the tooth is on its list of signs. Swelling of the face or jaw, swollen glands in the neck or a high temperature belong to the NHS's dental abscess list and mean being seen the same day, not a routine appointment — and trouble breathing, swallowing or speaking means emergency care.
Questions worth asking before agreeing to a second attempt
- What does the X-ray show, and can I see it?
- Why do you think the first treatment did not hold?
- Is this a retreatment or surgery, and why that one?
- Does the crown have to be remade, and is that in the price?
- What are the realistic odds for this tooth, in your hands?
- What is the alternative, and what does it cost over five years rather than today?
Nobody sensible will be annoyed by that list. The last one is the one that changes decisions, because it is the only question that compares the two paths on the same timescale.
The underlying prices — the original treatment, the crown, the exam that starts it — are on our page pricing root canal treatment from three published fee schedules. And if part of your question is whether a specialist should be doing the second attempt, that has its own chapter: what an endodontist is, and when it matters.
Questions about second attempts
Does retreatment cost more than the original root canal?
On both published schedules that price both, yes. Montana allows $652.08 for retreatment on a molar against $553.28 the first time, and Washington's corrections endodontic schedule allows $1,494.40 against $1,346.40. Pennsylvania's schedule carries no retreatment line at all. And the published difference understates the real one, because the restoration usually has to be redone as well.
How do I know if my root canal has failed?
Frequently you would not, on your own. A treated tooth has no nerve left to raise the alarm, and problems underneath one are often found on a review X-ray rather than felt. Where there are symptoms, the AAE's threshold is severe pain or pressure, or pain that lasts more than a few days. A pimple on the gum near the tooth is on its list of signs.
Can a root canal fail years later?
Nothing we read publishes a time limit in either direction, so we will not invent one. What the codes tell you is that retreatment is common enough to be priced in advance by more than one payer. The mechanisms that cause it — a leaking seal, a crack, new decay, a canal that could not be fully cleaned — do not have an expiry date.
Is surgery better than doing the root canal again?
That depends on the tooth and on what the X-ray shows, and it is not a preference you can express from a distance. What we can tell you is that the schedules treat them as entirely different procedures with very different fees, and that the spread between payers on the surgical option is the widest of anything we read — from $70.00 in Pennsylvania to $1,165.60 on a molar in Washington.
Should I just have the tooth out instead?
It is a legitimate option and sometimes the right one. It is also not the cheap option it looks like at the appointment, because the gap has costs of its own that no extraction fee includes. We have compared both paths properly on a separate page rather than answering it in a box here.
Carry on
The prices behind all of this are on what a root canal costs on three fee schedules.
Anaesthetic and Sedation for a Root Canal
Local anaesthetic is the default and is included in the procedure — it has no separate line on any schedule we read. Sedation is a different thing entirely, billed by the quarter hour, and it is worth knowing what that costs before you say yes.
Do You Need a Crown After a Root Canal?
On the schedules that price both, the crown is roughly half of the total bill — and the endodontists' own guidance says it depends mostly on which tooth it is. Back teeth generally get one; front teeth often do not.