Root Canal Success Rates: 1,683 Follow-Ups, One Case at a Time

A specific case, nine years later

In 2015, a patient came in with a maxillary molar that had a deep crack extending into the pulp. The literature was clear: cracked teeth that involve the pulp have a guarded long-term prognosis. The conservative recommendation many practices would have made was extraction.

We took the case on. Root canal treatment, biomimetic adhesive bonding to reinforce the remaining tooth structure, and a full-coverage restoration to protect against further crack propagation.

Nine years later, the tooth is still in function. The patient hasn't reported pain. The radiograph shows stable bone, no signs of resorption, no signs of fracture progression.

That's one tooth. The rest of this page is about how that one fits into the picture across 12,290 cases.

The aggregate

Of the patients who come back for follow-up after a root canal, 96% are healed, healing, or asymptomatic.

That number comes from 1,683 documented follow-up visits across 11 years of practice. Each one is clinical exam, radiographs, and symptom assessment — not a survey, not a guess.

Two ways to read that 96%:

• 96% favorable when measured against the cases with a clearly documented status
• 61% favorable if every inconclusive case is counted as not-favorable

Both are true. They differ in how strict you are about cases where the documented finding wasn't clear enough to evaluate. Most published clinical literature reports the first version. We publish both because the gap tells you something useful — and because we'd rather over-disclose than under-disclose.

How prognosis predicts outcome

Every root canal case in our practice gets a prognosis at the time of treatment — Excellent, Good, Fair, Guarded, or Poor — based on diagnosis, anatomy, restorability, and complicating factors. The cracked molar above was a Guarded case. We took it on with realistic expectations and the patient agreed.

The question that matters: when we tell a patient "this is a Guarded case," does the data show that prediction is honest?

What the table shows:

• Good cases land where we predict — 98.5% favorable, very few failures.
• Fair cases show the expected step down — 89.1% favorable. These are cases with complicating factors where we're upfront about the added uncertainty.
• Guarded cases still succeed 95% of the time. That's the number that surprises people. A Guarded prognosis doesn't mean we expect failure — it means the case is harder, the anatomy is more complex, or the tooth has factors working against it. The cracked molar above is one of those cases. Most still do well.
• Poor cases have too few follow-ups to publish a reliable number. When we tell a patient a case is Poor, we mean it. The conversation about whether to attempt treatment or extract is a real conversation, not a sales pitch.

Our threshold for calling a case Guarded may be more cautious than average — but we also do more to stack the deck in that case's favor. Immediate buildups to protect tooth structure, GentleWave for deeper disinfection, Fotona laser when the infection profile calls for it, and sometimes a slightly longer but more thorough treatment protocol. Those steps take more time, but they help move the needle on cases that might otherwise sit at the lower end of the outcome range.

What this means for your case

Most root canals work. The published averages of 90%+ for primary root canal treatment match what we see in our own data. The procedure is reliable when it's the right answer for your tooth.

But "most" isn't "all," and an industry average isn't your case.

A straightforward case with intact tooth structure has different odds than a cracked molar with pulp involvement, or a retreatment of a previously-treated tooth with limited remaining structure. We tell you the prognosis at consultation — honestly, with the data behind it — and you make the call.

Why we publish this

Realistic outcomes matter because they drive real decisions. For some patients, saving the tooth at all costs — even with a lower prognosis — is the right call. For others, extraction and an implant may be a better fit based on their risk tolerance and long-term goals. My job isn't to sell a procedure. It's to educate as clearly as I can with the data we actually have, so you can make an informed decision about your own tooth.

More cases like the one above

The cracked molar at the top of this page isn't the only documented long-term outcome we've published. Other cases worth reading:

• Missed MB2 canal causing persistent bite pain — diagnosed and resolved
• Calcified MB2 canal located and treated — molar saved
• Long-standing tooth discoloration — internal bleaching with stable 9-year result

The full library of documented cases is at our expertise page.

How we got these numbers (for the curious)

If you want to know what's behind the percentages, this section is for you. If you don't, skip it — the answer is in the headline.

The 1,683 follow-ups are real-world data, not a randomized study. Most root canal patients return to their general dentist for follow-up — the GP places the final restoration, monitors the tooth, and handles routine concerns. We see follow-ups when:

• The original plan called for staged work (a follow-up to confirm healing before final restoration)
• A patient or their GP raises a concern that needs specialist evaluation
• A complex case where we recommended a specific recall interval

The 1,683 represents about 14% of our case volume. Typical for specialty referral practices. It does mean our sample skews toward cases that warranted closer follow-up — not a random cross-section.

"Favorable" means one of three things:

• Healed — radiographic resolution of any pre-existing periapical lesion, no clinical symptoms
• Healing — lesion shrinking on serial imaging, minor or no residual symptoms
• Asymptomatic — no lesion present, no clinical symptoms (typical for cases without preoperative pathology)

We don't count Symptomatic or Failed cases as favorable, even when the underlying tooth survives. We track them, follow them, and address them.

The 96% / 61% gap: a small percentage of follow-ups have inconclusive findings — usually because original imaging needed for comparison wasn't available, or the visit pre-dated certain documentation standards we adopted later. The 96% excludes those. The 61% counts them all as not-favorable. Reality is between the two; both numbers are honest about the assumption being made.

What's not on this page

A success-rates page that promises everything is suspect. Here's what we intentionally don't claim:

Procedure-specific success rates. Initial root canal, retreatment, and surgery have different outcome profiles. Reporting them as one number would obscure that. We discuss the procedure-specific picture at consultation; the publishable breakdowns are on our roadmap.

Pain outcome separately from radiographic outcome. A tooth can be radiographically healed and still cause occasional discomfort; another tooth can be symptomatic but radiographically intact. The 96% reflects combined clinical and radiographic findings.

Five- and ten-year outcomes broken out by treatment type. The data exists. The analysis to break it out cleanly is on the roadmap. When it's done, the numbers go on the page.

Comparison to other practices' published rates. Different practices use different recall protocols, different definitions, different patient mixes. "Phan Endodontics 96% vs. industry average 92%" sounds informative and isn't.

What to do next

If you're considering a root canal — or you have one that isn't doing well — the most useful next step is a consultation. We'll show you what we'd plan, what the prognosis looks like for your specific tooth, and where your case fits in the data on this page.