A patient in her forties sits down in the chair holding a radiograph. A lower first molar, root canal treated eight years ago, has been painful on biting for several weeks. On the image — a darker area at the apex of the root. Two sentences follow, a statement and a question: “I have been told that this tooth is not worth keeping. Should I save the tooth or have an implant?”.
The answer is this: the choice is not determined by the mere presence of a lesion on the radiograph, nor by the number of previous treatments, but by how much of the tooth’s own structure remains above the gum and by the condition of the periodontium. Where the walls of the tooth are well preserved, conservative treatment has a very good prognosis and is worth undertaking. Where only residual structure remains, the prognosis for the restoration falls far enough that an implant becomes the more sensible choice. There is no rule that “an implant is always better”.
Key takeaways
- After root canal treatment, teeth are lost at an average rate of about 2% per year; five- year survival reaches 91%, which is roughly nine teeth out of ten.
- What decides the fate of a tooth is above all whether it can be restored, not the root canal treatment itself.
- Implants have high survival rates, but the tissues around them can become diseased and require ongoing care.
- A tooth that has been saved leaves an implant as an option for the future — the reverse order does not exist.
Why the question “save the tooth or place an implant” has no single answer
The reason is simple: these two “survival rates” measure different things. A tooth we are fighting for is by definition damaged. An implant is placed into bone that is usually healthy, in a patient who has already been assessed as suitable for the procedure. Comparing these figures directly is rather like comparing the mileage of a car after a crash with that of a car straight from the showroom.
The second trap is the definition of success. A tooth that is still in place but requires annual intervention has formally “survived”. So has an implant with progressing inflammation and bone loss around it. It is therefore worth asking the clinician not only “will this hold”, but also “what will happen along the way”.
How long a root canal treated tooth really “lasts”
The data here are better than the common belief that “a root canal treated tooth will come out anyway” would suggest.
A literature review published in International Endodontic Journal shows that after root canal treatment teeth are lost at an average rate of about 2% per year. In a Swedish population, the five-year survival of root canal treated teeth was calculated at 91% — meaning that after five years roughly nine teeth out of ten are still in the mouth. Interestingly, the survival of the root canal treatment itself, understood as no need for repeat intervention, was somewhat lower in the same analysis, at 88%.
This difference matters in practice: some teeth require additional treatment along the way and are saved nonetheless. The authors of the review emphasise that whether a tooth stays in the mouth depends above all on whether it can be restored.
In other words: the fate of a tooth is more often decided by the restorative dentist than by the endodontist. That shift of emphasis lies at the heart of an honest answer to the question “save the tooth or place an implant”.
How much of your own tooth is left — the factor that most often decides
If only one prognostic parameter were to be kept, it would be the amount of the tooth’s own remaining tissue above the gum.
A clinical review of the restoration of root filled teeth has gathered data that are hard to overlook. In a study of molars restored with a filling, without cuspal coverage by a crown, 78% of the teeth with the greatest number of remaining walls survived five years, 45% of those with an intermediate amount, and only 18% of those with the least remaining structure of their own. In practical terms: where the walls were solidly preserved roughly four teeth in five survived, whereas with only residual structure — fewer than one in five.
The second parameter is the so-called ferrule (a band of healthy tooth tissue, at least 1.5–2 mm high, that the crown encircles from the outside). In one of the studies discussed in that review — 87 teeth followed for three years — the restoration failed in 16.1% of cases overall. Where the ferrule was less than 2 mm, 26.2% of restorations failed, which is roughly one in four. Where it exceeded 2 mm — 6.67%, roughly one in fifteen. This is the same procedure carried out on two different foundations.
Restorations built on glass fibre posts achieve around 90% survival at five to seven years in this review — provided that the conditions above are met.
From the perspective of the clinical team at Modern Dental & Orthodontics (Klinika MDO), what matters is that the amount of remaining tissue should be assessed before the decision on root canal treatment is taken, and not afterwards. The situation in which a tooth undergoes full endodontic treatment and only then turns out to have nothing left on which to seat a crown is avoidable — and it is the most costly for the patient, biologically as well. We have described the course of the procedure itself in the article on what root canal treatment looks like step by step.
Vertical root fracture — the situation in which fighting on makes no sense
There is one scenario in which the discussion about prognosis usually ends. A vertical root fracture (a crack running along the root) is described in a review in International Endodontic Journal as a complication with a poor prognosis, for which the standard management remains extraction of the tooth or, less often, removal of the affected root.
Diagnosis, however, can be difficult: for a long time the fracture produces no characteristic symptoms, and a conventional radiograph often does not settle the matter. Cone-beam computed tomography (CBCT) usually does not show the fracture line itself, but it does show the pattern of bone loss typical of it. For that reason, where there is a recurrent abscess, a narrow deep pocket at a single tooth and pain on biting, it is worth asking for more detailed diagnostics before a decision is taken on further root canal treatment.
What “implant survival” really means
Implants have very good outcomes. It is worth knowing, however, what those figures cover.
In a long-term study of full-arch restorations, published in International Journal of Implant Dentistry and covering more than 2,300 implants over a period of three to seventeen years, 97–99% of the fixtures survived. These are data from full-arch reconstructions, not from single implants — but they show the scale of the phenomenon. Calculated per patient, the results were lower (94–97%), because one person may lose more than one implant. These are very good results — but not one hundred per cent.
The second area is the crown itself. A meta-analysis in Clinical Oral Implants Research reported a three-year survival of veneered reinforced glass-ceramic crowns of 97.6%, but also a real risk of ceramic chipping — lower with monolithic crowns. A crown on an implant is not a maintenance-free component and after some years it may need replacing.
The third area is the tissue around the implant. The guidelines of the European Federation of Periodontology, published in Journal of Clinical Periodontology, classify peri-implant mucositis (inflammation of the mucosa around the implant) and peri-implantitis (inflammation involving the bone as well) as common conditions and indicate that a patient with implants requires regular supportive care. We have devoted a separate article to peri- implantitis and inflammation around the implant.
The conclusion: implant treatment gives a predictable result, but it does not release anyone from hygiene and check-ups. An implant cannot decay — but the tissues around it can become diseased.
The biological cost that the statistics do not show
Survival statistics are silent about something important: irreversibility.
Extracting a tooth sets off resorption of the alveolar ridge (the bony base in which the roots of the teeth are seated). In some patients this means additional procedures — bone augmentation or a sinus lift — before an implant can be placed.
A natural tooth has a periodontal ligament — the ligament connecting the root to the bone, with sensory receptors. Thanks to it we sense the force of the bite, and the tooth has a minimal mobility that cushions overload. An implant fuses directly with the bone (osseointegration) and does not reproduce this.
There is also the sequential argument: a tooth that has been saved leaves an implant as an option for the future, whereas an extracted tooth leaves no way back. If the prognosis is uncertain but not hopeless, an attempt to save the tooth closes nothing off — provided it is undertaken deliberately and with an agreed date for reviewing the result.
In conversations with patients attending Modern Dental & Orthodontics (Klinika MDO), one question recurs: whether “settling the matter once and for all” with an implant is not simply more convenient. Sometimes it is — but convenience is not the same as fewer appointments, nor as freedom from further care.
What happens if I do not decide now
This question is asked rarely, yet it is one of the important ones. “Doing nothing” is not a neutral choice — it quietly changes the prognosis.
A tooth with an incompletely treated infection usually does not hurt constantly; the pain tends to be intermittent and to subside on its own, which is easily read as improvement. During that time bone around the root is being lost and the walls of the tooth crumble with each successive bite. A tooth that today qualifies for restoration with a crown may no longer qualify a year from now — and then the decision makes itself. After an extraction the gap does not remain unchanged either: the neighbouring teeth tilt into it and the opposing tooth over-erupts towards it, which later complicates every restoration — an implant, a bridge or a denture.
Do not postpone an appointment if any of the following symptoms appear:
- difficulty swallowing, opening the mouth or breathing, swelling under the jaw, a change in the sound of the voice,
- swelling of the cheek or of the area around the eye, fever, feeling generally unwell,
- discharge of pus, an unpleasant taste in the mouth, a sinus tract on the gum,
- pain increasing from day to day or waking you at night,
- mobility of the tooth that was not present before.
The first point is an emergency — with these symptoms you should attend an accident and emergency department rather than wait for a dental appointment. The remaining points indicate spreading infection and require urgent consultation — regardless of what the final decision about the tooth turns out to be.
Clinical scenario, decision and prognosis — comparison table
The table below does not replace diagnosis, but it organises the situations in which the question arises: save the tooth or place an implant.
| Clinical scenario | Direction of the decision | Prognosis and comments |
| Root canal treated tooth, walls preserved, ferrule over 2 mm, periodontium healthy | Save and restore with a crown | Very good — in this group restoration failure affects roughly one restoration in fifteen |
| Periapical lesion, canals previously treated inadequately, tooth tissue preserved | Root canal retreatment under the microscope | Good — improvement is realistically achievable, provided the canals can be accessed |
| Tooth with a destroyed crown, ferrule below 2 mm, requiring surgical crown lengthening | Individual decision, often an implant | Guarded — with only residual structure, fewer than one tooth in five survives five years |
| Vertical root fracture confirmed diagnostically | Extraction and restoration with an implant | Poor — the standard is extraction of the tooth, less often amputation of the affected root |
| Advanced bone loss around the tooth, mobility, periodontal pockets | Periodontal treatment first, then the decision | Guarded — an implant in an unstable periodontium transfers the problem rather than solving it |
| Multirooted tooth with destruction of one root, the others healthy | Consider hemisection or root resection | Moderate — a demanding solution, but it allows extraction to be deferred |
| Any scenario in a person who smokes, has poorly controlled diabetes or poor oral hygiene | Deferral of the implant decision, stabilisation first | Both options carry an increased risk of complications |
Six questions worth asking your clinician
“This tooth is not worth keeping”, heard in the surgery, is a conclusion, not a justification. The questions below allow you to hear that justification — and to check whether the decision rests on an assessment of this particular tooth.
- “How much healthy wall of my tooth is left above the gum?” This is the single strongest prognostic factor. A good answer is specific: how many walls remain and whether they are visible in the mouth or only below the gum.
- “Can a ferrule of at least 2 mm be obtained for the crown?” If not, a good answer is: “no, unless we surgically lengthen the clinical crown”, rather than a general “we will manage”.
- “What is the condition of the periodontium around this tooth and the adjacent ones?” Advanced bone loss worsens the prognosis of both pathways, so the answer should be given regardless of the option chosen.
- “Has a vertical root fracture been ruled out?” If the symptoms suggest one, a good answer includes a diagnostic plan, not reassurance alone.
- “Does anything in my health or my habits change the prognosis?” Smoking, poorly controlled diabetes and bruxism affect both pathways and should be discussed before a decision is taken.
- “What does care after treatment look like, and what happens if it does not work?” Both a saved tooth and an implant require monitoring. The answer should include a plan B.
If you still have doubts after this conversation, a second opinion is normal practice, not a lack of trust. It is worth asking for a copy of the radiographs or of the CBCT scan as a file, and for a written treatment plan — this makes it possible to compare proposals without repeating the diagnostics and without an additional dose of radiation.
A reversible decision and a final one
A practical rule that orders most cases: if the prognosis of the tooth is uncertain but realistic, an attempt to save it is justified, with a clearly defined review point — usually after six to twelve months, with radiographic and clinical assessment. If there is no improvement in that time, we move to the implant option. In all honesty: such an attempt comes at a cost — time, the cost of endodontic treatment and of a temporary restoration, sometimes further bone loss. It therefore makes sense only where the prognosis is realistic, and not “just in case”.
The reverse order does not exist. That is why the most honest way to reframe the question “save the tooth or place an implant” is not “which is better”, but “is there enough structure left in this particular tooth for an attempt to save it to have a predictable outcome”.
Frequently asked questions
Is root canal retreatment worthwhile if the first treatment failed? In many cases it is. Failure of the primary treatment most often results from missed or inaccessible canals or from a leaking restoration, rather than from the tooth being “beyond saving”. The conditions are preserved tooth structure, patency of the canals and the possibility of providing a well-sealed restoration once endodontic treatment is complete.
How long does the whole process take with each option? Primary root canal treatment is most often completed in a single visit; retreatment may require two. Together with the prosthetic restoration this comes to between one and three months in total. The staged implant pathway takes from a few months to well over a year; in selected situations an implant can be placed on the day the tooth is extracted.
Is an implant more painful than root canal treatment? Both procedures are carried out under local anaesthesia and should not be painful while they are being performed. The difference concerns the period afterwards — after implant placement, swelling and discomfort related to the healing of soft tissue and bone are more common. Sensations are individual, however, and depend on the extent of the procedure.
Will an implant last longer than a saved tooth? This cannot be settled in general terms, because the two sets of figures measure different things. An implant in good bone conditions has a very high survival rate over long-term follow-up, but a tooth with preserved structure and a properly made restoration also performs well. Where only residual tooth structure remains, the advantage of the implant becomes clear.
For whom is an implant the better choice from the outset? Above all for patients with a confirmed vertical root fracture, with advanced root resorption, and in situations where, once the cavity has been prepared, insufficient tissue of their own remains on which to seat a crown. What decides is the clinical and radiographic assessment, not the number of previous treatments of that tooth.
What does the cost of each solution depend on? The cost of saving a tooth comprises endodontic treatment, a possible post and core, and a prosthetic crown. The cost of the implant pathway comprises extraction of the tooth, possible bone reconstruction, the implant, the abutment and the crown. The number of stages required is established after diagnosis and planning, not before.
Can the decision wait? A short delay is usually possible if there is no acute inflammation and the tooth is not breaking down further. Treatment should not, however, be postponed where there is facial swelling, fever or increasing pain — these situations require urgent intervention, regardless of what the final decision turns out to be.
Summary
The question “save the tooth or place an implant” only makes sense once it has been assessed how much of the tooth’s own structure remains and what condition the periodontium is in. A root canal treated tooth in good conditions survives five years in about nine cases out of ten, and with a solid ferrule the restoration rarely fails. Where only residual structure remains, the results are considerably worse and an implant is then the more sensible choice. Implants have high survival rates, but they require ongoing care. A tooth that has been saved leaves an implant as an option for the future — the reverse order is not possible. Postponing the decision is not neutral either. The final decision depends on an individual diagnosis.
Read more:
- Implant treatment — services at Modern Dental & Orthodontics (Klinika MDO)
- Dental implant vs bridge — which is better?
- Root canal treatment step by step — how long it takes and what to expect
- Bone regeneration around teeth (GTR/GBR) — when a tooth can be saved instead of extracted
- Immediate dental implant — when can it be placed on the day of tooth extraction?
Content and liability disclaimer
This article is informational and educational in nature and does not constitute medical advice, a diagnosis or a therapeutic recommendation — it does not replace a consultation with a specialist. If you are experiencing symptoms, have doubts or are facing a decision about treatment, consult a dentist. The methods described and the data cited are general in nature. The results of scientific studies relate to populations, not to an individual patient. The course and outcome of therapy depend on the individual clinical situation and may vary between patients. No information contained in this article constitutes a guarantee of result. The content has been prepared with due care, based on publicly available medical knowledge and the scientific publications indicated in the Sources section. We do not advise taking or refraining from any health-related action solely on the basis of the content of this article, without prior consultation with a doctor.
Sources
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Source 2 Links https://doi.org/10.1111/iej.13438 │ https://pubmed.ncbi.nlm.nih.gov/33128279/ Description Bhuva B, Giovarruscio M, Rahim N, Bitter K, Mannocci F. „The restoration of root filled teeth: a review of the clinical literature.” International Endodontic Journal. 2021;54(4):509-535.
Source 3 Links https://doi.org/10.1111/iej.13737 │ https://pubmed.ncbi.nlm.nih.gov/35338655/ Description Patel S, Bhuva B, Bose R. „Present status and future directions: vertical root fractures in root filled teeth.” International Endodontic Journal. 2022;55(Suppl 3):804-826.
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Source 5 Links https://doi.org/10.1111/jcpe.13823 │ https://pubmed.ncbi.nlm.nih.gov/37271498/ Description Herrera D, Berglundh T, Schwarz F, Chapple I, Jepsen S, Sculean A, i wsp. „Prevention and treatment of peri-implant diseases — The EFP S3 level clinical practice guideline.” Journal of Clinical Periodontology. 2023;50(Suppl 26):4-76.
Source 6 Links https://doi.org/10.1186/s40729-023-00511-0 │ https://pubmed.ncbi.nlm.nih.gov/37938479/ Description Uesugi T, Shimoo Y, Munakata M, Sato D, Yamaguchi K, Fujimaki M, Nakayama K, Watanabe T, Malo P. „The All-on-four concept for fixed full-arch rehabilitation of the edentulous maxilla and mandible: a longitudinal study in Japanese patients with 3–17-year follow-up and analysis of risk factors for survival rate.” International Journal of Implant Dentistry. 2023;9(1):43.