Save the Tooth or Get an Implant? What 30 Years of Evidence Actually Says

One of the most common situations in modern dentistry: a tooth has a deep cavity, an old failing crown, or a previous root canal that didn't fully heal. The dentist sits down and lays out two options — save it with a root canal (often combined with a crown), or extract it and place a dental implant.

Patients often hear some version of: "Implants are 95% successful, root canals only last about 10 years on average. The implant is the more predictable choice."

That sentence is repeated so often that most people accept it. The published evidence, however, says something different. The conversation deserves a much more honest framing.

The Apples-to-Oranges Problem

The single biggest source of confusion in this debate is that researchers measure implant outcomes and tooth outcomes using completely different yardsticks.¹

• For natural teeth, the standard is success: the tooth must be functional, asymptomatic, and show complete healing of any infection on the X-ray. By this strict definition, root canal success rates are typically reported as 85–93% in modern studies.
• For implants, the standard is most often survival: the implant is still in the mouth at the follow-up visit, regardless of whether bone is being lost, whether there is bleeding around it, or whether the patient is in discomfort.

When both are measured by survival, the story flips. A meta-analysis by Iqbal and Kim found no statistically significant difference between long-term survival of single implants and endodontically treated teeth — both around 94–95% at multiple years.²

When both are measured by success (functional, healthy, no problems), one large prospective study of more than 1,000 implants found a 7-year cumulative survival rate of 92.2% — but a cumulative success rate of only 83.4%.³ Other studies have shown success rates as low as 63–78% depending on the type of restoration the implant supports.⁴

In other words: a meaningful number of implants are still in the mouth but no longer healthy. They are counted as "successful" in headlines, but the patient may be dealing with bone loss, gum inflammation, or eventual implant loss within 10–15 years.

What Actually Drives Long-Term Outcomes

The decision between saving a tooth and replacing it should not be based on a generic statistic. It should be based on the specific situation in your mouth. The factors that genuinely matter:

1. How much healthy tooth structure is left

If the tooth has cracked below the bone, has decay extending into the root, or has lost so much structure that it cannot be restored predictably with a crown, an implant is usually the right call. If the tooth still has solid walls and a stable root, a root canal followed by a crown is highly successful.

2. The condition of the root

Root fractures, severe resorption, and previously failed root canals with separated instruments may make the tooth a poor candidate. A specialist endodontist can evaluate this with a CBCT scan and tell you honestly whether the tooth is restorable.

3. The complications profile of each option

This is the part most patients never hear about. Both options can have problems. The differences are in what kind of problem you might face:

4. The quality of the work being offered

This is the part dentists rarely say out loud. A root canal performed by a specialist endodontist using a microscope, modern rotary files, and a CBCT scan when needed is a fundamentally different procedure from one performed in 30 minutes by a general dentist without magnification. Similarly, a well-placed implant by an experienced surgeon is fundamentally different from a poorly positioned one.

If a tooth is being recommended for extraction because the dentist isn't comfortable with the case, getting a second opinion from a specialist who is comfortable can change the recommendation entirely.

The Best Choice Is Usually "Try to Save It First"

The published consensus, even from prosthodontists and oral surgeons who place many implants, is that retaining the natural tooth should be the first option whenever it is restorable.⁵ The reasons:

• Once a tooth is extracted, the bone underneath it begins to resorb within weeks. Even with a graft, you cannot get the original anatomy back.
• The natural tooth comes with a periodontal ligament — a layer of fibers that gives you proprioception (the ability to feel pressure, texture, and the sensation of biting). Implants do not have this. Patients with implants frequently bite down too hard, sometimes cracking the opposing tooth.
• Implants work, but they are not permanent. The 20-year and 30-year data on modern implants is still being collected. We have decades of evidence that natural teeth, properly cared for, last a lifetime.
• If a saved tooth eventually fails years later, you can still get an implant then. If an implant fails, the bone loss often makes the next implant harder.

Endodontics and implantology should complement each other, not compete. The right answer for any specific tooth depends on the specific situation — and that requires an honest evaluation by a specialist who is not paid more for choosing one path over the other.

How We Approach the Decision

At Silicon Valley Endodontics, we do not place implants. That matters. When a patient comes in for a consultation, we have no financial reason to push toward saving a tooth that should be extracted, and no reason to push toward extraction either. We give the same honest assessment we would give to a family member.

For each tooth in question, we evaluate:

1. Restorability — is there enough healthy tooth structure for a crown to grip onto and last?
2. Periodontal health — is the gum and bone around the tooth healthy enough to support it long-term?
3. Endodontic prognosis — based on a CBCT scan and microscope examination, can we predictably clean and seal the canal anatomy?
4. Strategic value — is this tooth needed as part of the bite, or as an anchor for other work?

If the answer to any of those is "no," we say so plainly. We refer the patient to one of several oral surgeons and prosthodontists we trust for implant placement. If the answer is "yes," we explain what success and failure look like, give a written estimate, and let the patient decide.

If you have been told a tooth needs to come out — or have already been told an implant is the only option — a 30-minute consultation with a specialist is worth getting before you commit. Schedule a consultation or call (669) 234-2354.

References
1. Setzer FC, Kim S. Comparison of long-term survival of implants and endodontically treated teeth. Journal of Dental Research 2014;93(1):19–26.
2. Iqbal MK, Kim S. For teeth requiring endodontic treatment, what are the differences in outcomes of restored endodontically treated teeth compared to implant-supported restorations? International Journal of Oral & Maxillofacial Implants 2007;22(Suppl):96–116.
3. Brocard D, Barthet P, Baysse E, et al. A multicenter report on 1,022 consecutively placed ITI implants: a 7-year longitudinal study. International Journal of Oral & Maxillofacial Implants 2000;15:691–700.
4. Romeo E, Lops D, Margutti E, Ghisolfi M, Chiapasco M, Vogel G. Long-term survival and success of oral implants in the treatment of full and partial arches: a 7-year prospective study with the ITI dental implant system. International Journal of Oral & Maxillofacial Implants 2004;19:247–259.
5. Torabinejad M, Anderson P, Bader J, et al. Outcomes of root canal treatment and restoration, implant-supported single crowns, fixed partial dentures, and extraction without replacement: a systematic review. Journal of Prosthetic Dentistry 2007;98:285–311.