Root Canal Retreatment vs Surgery vs Extraction
Retreatment is a second root canal on a tooth that has already had one. The old filling material is removed from the canals, the canal system is re-cleaned and reshaped — usually finding anatomy that was missed the first time — and it is refilled and sealed.
What endodontic retreatment involves
Retreatment is a second root canal on a tooth that has already had one. The old filling material is removed from the canals, the canal system is re-cleaned and reshaped — usually finding anatomy that was missed the first time — and it is refilled and sealed. It is consistently harder than the original treatment. The previous filling material has to come out without damaging the root, there may be a post cemented in the canal that must be removed first, the canals may have been left partly untreated or blocked, and the tooth typically has a crown on it that has to be drilled through or removed. Fees and chair time reflect that.
When this treatment is used
Indicated when a previously root-treated tooth remains symptomatic, develops an abscess, or shows a persistent or new lesion at the root tip on imaging. The usual underlying cause is a canal that was never located, inadequate cleaning, or a seal that has leaked over the years.
Retreatment, surgery, or extraction
Three real options, with different profiles. Conventional retreatment goes back through the crown, addresses the actual cause — usually missed anatomy — and has good success rates, but requires dismantling the existing restoration. Apical surgery (D3410–D3425) approaches from the side through the gum, seals the root end, and leaves the crown untouched, which is attractive when the restoration is new and expensive. Extraction and replacement ends the problem definitively at higher lifetime cost. Contemporary practice generally favours retreatment first where the cause is likely to be inside the canal, and surgery where the canal work looks adequate or where retreatment is not feasible. A tooth that has already had retreatment and surgery and is still symptomatic has usually reached the end of the road.
What insurance does with it
Plans commonly impose a waiting period after the original root canal — often declining to pay retreatment within twelve or twenty-four months of the first treatment, on the basis that early failure is the provider's responsibility. Many also count the original treatment and the retreatment against a single per-tooth lifetime allowance. If the original treatment was done elsewhere, bring the date. It changes the answer.
Costs and insurance in summary
Typical fee range across the group: $0–$0 where a single band applies. Several codes here are priced individually and carry their own range on their own page. Priced above the original root canal on the same tooth. Removing a post or dismantling a crown adds further separate charges.
Benefit category: Basic / major, typically 50–80% on a typical plan. Covered like original endodontic treatment, but with waiting periods after the first treatment and sometimes a shared per-tooth lifetime allowance.
Common restrictions: Often not payable within 12–24 months of the original root canal; May share a lifetime allowance with the original treatment; Pre-authorisation commonly requested; Crown replacement afterwards draws on the annual maximum.
The codes this guide covers
Each of these describes a variant of the same procedure. Follow a code for its own fee range, its coverage notes and what distinguishes it from the rest of the group.
| Code | Variant | Typical fee |
|---|---|---|
| D3346 | Retreatment of previous root canal therapy — anterior | $900–$1,700 |
| D3347 | Retreatment of previous root canal therapy — premolar | $1,000–$1,900 |
| D3348 | Retreatment of previous root canal therapy — molar — most reported | $1,200–$2,400 |
Common questions
Why did my root canal fail?
Most often because a canal was never located and treated, or because the seal leaked over the years and bacteria re-entered. Complex anatomy in molars is the usual reason a canal gets missed.
Is retreatment or surgery better?
Retreatment addresses the cause directly and is usually preferred when the problem is likely inside the canal. Surgery is chosen when the canal work looks adequate, when retreatment is not feasible, or when dismantling a new crown is undesirable.
Does retreatment cost more than the original root canal?
Yes, generally. It takes longer, requires removing the old filling material and often a post and crown, and is technically more demanding.
Will insurance pay for a second root canal on the same tooth?
Usually, but many plans impose a waiting period after the original treatment and some apply a shared per-tooth lifetime allowance.