Most root canals last a lifetime, but occasionally a treated tooth does not heal as expected, or becomes painful or infected months or years later. This can happen when a canal is unusually narrow or curved, when a new cavity or a cracked restoration lets bacteria back in, or when hidden anatomy was not fully treated the first time. Retreatment gives the tooth a genuine second chance before extraction is ever considered.
During endodontic retreatment, Dr. Leong reopens the tooth and carefully removes the previous filling material from inside the canals. Working under an operating microscope, she inspects the canal system for missed anatomy, additional canals, or the source of persistent infection, cleans and disinfects thoroughly, and reseals the space. When appropriate, cone beam 3D imaging is used beforehand to map the tooth and plan the approach with precision.
Retreatment is often more intricate than an initial root canal because the tooth must first be carefully disassembled without weakening it. This is exactly the kind of complex case that benefits from a specialist. If a tooth cannot be predictably saved through the crown, surgical options such as an apicoectomy may be discussed. Our priority is always the most conservative treatment that gives your natural tooth the best long-term outlook.
Choosing retreatment usually means keeping a tooth you already have rather than moving to extraction and an implant or bridge. For many patients that is the more comfortable, more economical path, and it preserves the natural tooth that your bite and bone are built around.
This page is for general education and is not a substitute for an in-person examination. An evaluation confirms whether endodontic retreatment is right for your situation.
Benefits
- A conservative alternative to extraction for a failing root canal
- Microscope inspection finds missed or unusual canal anatomy
- Removes the source of lingering infection or discomfort
- Preserves your natural tooth and existing bite
- Planned with 3D imaging for predictability
What happens during treatment
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Review & 3D imaging
We evaluate the previous treatment and often use cone beam 3D imaging to understand exactly why the tooth is symptomatic.
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Careful access
The existing crown or filling is accessed and previous canal material is removed without weakening the tooth.
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Re-cleaning
Under magnification, the canals are re-disinfected and any missed anatomy is located and treated.
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Reseal & restore
The canals are resealed and the tooth is closed, then restored by your dentist to protect it going forward.
What to expect at your visit
We start by explaining what likely happened and why, using your images so the plan makes sense. The visit is thorough and unhurried, and comfort options are available. Because these cases are detailed, we give the tooth the time it deserves rather than rushing.
Is this right for you?
Retreatment may be right for you if a tooth that had a root canal is tender, painful, or swollen, if a bump has appeared on the gum, or if your dentist sees signs of infection on an X-ray. We will confirm whether the tooth can be predictably saved before recommending a path.
Why patients choose Ocean Endodontics
Retreatment rewards experience and magnification. Dr. Leong routinely handles teeth with complex or previously missed anatomy, and treats them under the microscope with the patience these cases require. That is the difference a dedicated endodontist makes.
Recovery & aftercare
Expect mild soreness for a few days, managed with over-the-counter pain relievers. Protect the tooth by chewing elsewhere until your dentist places the final restoration, and contact us if symptoms worsen instead of easing.
Cost & insurance
Retreatment is frequently covered by dental insurance, though benefits vary by plan and history. We verify coverage and review your estimate before any treatment, and we will always be candid if a tooth has a poor long-term outlook.
For details on coverage and payment options, see insurance & financing, and if this is your first visit, our new patient guide walks through exactly what to expect.
Related reading: What Is a Root Canal, Really? in our Education Center.
We provide endodontic retreatment to patients across San Francisco’s west side, including Lake Merced, West Portal, and Balboa Terrace. See all the areas we serve.
