Should a dead tooth have root canal treatment or be removed?

Key points in brief

• A dead tooth is one whose pulp, the tissue inside it that contains the nerves, has died. Root canal treatment usually allows it to be kept for many years if enough sound tooth tissue remains and the bone and gum can hold it.
• If one of these conditions is missing, removing the tooth is sometimes the wiser choice. For a tooth that is difficult to treat, it also matters whether you need it for your bite.
• A dead tooth often does not hurt, but it will not heal by itself, and putting off treatment increases the risk that the weakened tooth will break. Soon after root canal treatment, the tooth needs to be sealed tightly with a filling or a crown.
• If you have swelling, a fever or severe pain that medication does not relieve, see the nearest available dentist or an urgent dental care service the same day.
• Go to the emergency department or call 112 if you have shortness of breath, difficulty swallowing, breathing or opening your mouth, swelling spreading to the neck, under the tongue or under the eye, or a high fever with feeling unwell.

Does a dead tooth hurt, and how does a dentist tell that the pulp has died?

A dead tooth often does not hurt, because the pulp can die slowly and without clear symptoms. The dead pulp inside the canals, the narrow spaces within the roots, usually becomes infected. This is known as infected pulp necrosis, or by an older name, pulp gangrene. Pain usually appears only once the inflammation spreads to the tissues around the root - the tooth hurts when you bite on it, feels higher than the teeth next to it, or the gum beside it swells.

A dentist does not diagnose a dead pulp from a single test. They usually start by checking whether the tooth can feel a stimulus, and this is what the cold test and the electric pulp test are for. A cold test can give a misleading result in fewer than 1 tooth in 10, and more often in a tooth covered by a crown. That is why the dentist compares the tooth with its neighbours, taps on it and sometimes repeats the test at the next visit.

An X-ray sometimes shows a darker patch at the end of the root. This is a lesion at the root tip, a place where inflammation has caused the bone to break down. The colour of the tooth is not a reliable sign: a grey tooth after an injury is sometimes still alive, and a tooth with a dead pulp often looks quite ordinary.

In everyday speech, a tooth that has had root canal treatment is also called dead. When such a tooth causes trouble again, the dentist assesses it by different rules from a previously untreated tooth with a dead pulp. In that case they consider root canal retreatment.

What to ask your dentist before a decision is made about the tooth

These questions will help you understand what lies behind your dentist's proposal:

• Can this tooth be properly restored after treatment, and with what?
• Are the gum and bone around the tooth healthy?
• Is this tooth needed for chewing or to support a bridge?
• What will happen if I put off the decision for a few months?
• How many visits will I need, and what happens after the root canal treatment?

If your dentist suggests removing the tooth, ask what speaks against treating it.

Does a dead tooth have to be removed: three questions it depends on

A dead tooth usually does not need to be removed if enough sound tissue remains in it and the bone and gum can hold it. Root canal treatment fights the infection in the root, but it does not make the tooth stronger.

So the dentist assesses the tooth in a fixed order, because each question only makes sense once the previous one has a favourable answer. If all the answers are favourable, they suggest root canal treatment and then seal the tooth with a filling, an onlay or a crown. An onlay is a restoration that covers part of the tooth. A dental technician makes it in a laboratory, and the dentist bonds it to the tooth.

1. Will enough sound tissue remain to seal the tooth tightly?

The dentist removes the decay and the old filling, and then assesses what is left. This is why the final decision is sometimes made only at the first treatment visit. What matters most is the ferrule: a band of sound tooth wall all the way round, just above the gum, which a crown or other restoration will wrap around. There are many indications that a tooth with a ferrule lasts longer, although it is not known exactly by how much.

• There is a ferrule: the dentist moves on to the second question.
• Sound tissue ends just below the gum: surgical crown lengthening can sometimes help. In this procedure the dentist exposes the part of the tooth hidden under the gum. Some of the bone around the tooth is removed in the process, so the procedure does not always make sense.
• The tooth is broken down deep below the gum and the bone: removing it is the wiser choice.

2. Will the bone and gum hold the tooth?

The dentist checks whether the tooth is loose, uses a thin probe to measure the pockets - the gaps between the gum and the tooth - and looks at an X-ray to see how much bone is left around the root. Over the years, patients lose root-canal-treated teeth with deep pockets markedly more often than those with shallower ones. Looseness and a single narrow, deep pocket do not always mean gum disease. They may be the result of infection at the root, and in that case they may shrink after root canal treatment. Sometimes such a pocket is a sign of a root fracture.

• The bone and gum are in good condition: the dentist moves on to the third question.
• Bone loss is advanced: the dentist then gives the tooth root canal treatment and also treats the periodontium, the tissues that hold the tooth in the bone. The decision about the tooth is usually made after the periodontal treatment.
• The chance that the tooth will survive is very small even with periodontal treatment: removing it is considered.

3. Is this tooth needed for your bite?

The tooth's role in your bite matters when the tooth will be difficult to treat, for example when its canals are strongly curved. The dentist checks whether the tooth has an opposing tooth, the one it meets when you bite. They also assess whether it is, or is meant to become, an abutment, a tooth that supports a bridge, and whether losing it would change anything about how you bite or how your smile looks. Wisdom teeth are assessed differently, above all by whether you bite with them at all.

• The tooth is needed for your bite: it is usually worth treating, even if it means more visits.
• A molar has no opposing tooth, supports nothing, and its canals are very difficult to treat: the dentist is more likely to suggest removing it.
• The canals are not particularly difficult: the lack of an opposing tooth alone is usually not a reason to remove the tooth.

When the root has fractured vertically

The dentist assesses a vertical root fracture separately, regardless of the three questions. In a previously untreated tooth it is rare, and it usually ends with the tooth being removed.

When a dead tooth is worth keeping and what its lifespan depends on

After 10 years, roughly 8 in 10 teeth that have had root canal treatment are still in the mouth. When such a tooth does eventually have to be removed, a common reason is that the tooth has broken above the gum, or that decay has developed under a leaking filling or crown. Failure of the root canal treatment itself is a less common cause.

That is why, after root canal treatment, the tooth is sealed tightly and without a long delay - usually within a few weeks. Back teeth that received an onlay or a crown more than a year after root canal treatment markedly more often needed further treatment or had to be removed. The dentist chooses a filling, an onlay or a crown according to how many walls of the tooth remain, and not every tooth needs a crown after root canal treatment.

After a tooth with a dead pulp has been treated, the lesion at the root disappears from the X-ray in roughly 8 teeth out of 10 and at least gets smaller in more than 9 out of 10. A tooth without such a lesion has better prospects after treatment.

When removing the tooth is wiser than treating it

Removing a dead tooth is usually the wiser choice when it cannot be sealed tightly, when the bone and gum will not hold it even with periodontal treatment, or when the root has fractured vertically. Sometimes the choice is not obvious, because the tooth can be treated but the chances are uncertain and the treatment will take a long time. The dentist then sets out both options and explains what the success of each one depends on.

After the tooth has been removed, the dentist assesses whether and how to fill the gap, usually with a bridge or an implant. If you are unsure whether it is better to save the tooth or place an implant, talk it over with your dentist before the tooth is removed.

What happens when the decision about a dead tooth is put off

A dead pulp will not heal by itself, because the infection stays in the canals. A lesion at the root may cause no symptoms and not grow for years, but it may also get bigger. The larger it is, the longer it takes to heal after treatment. There is no way of predicting in advance in whom it will stay small, so the dentist does not suggest waiting instead of treating. A tooth with a large cavity breaks more easily. Delay can therefore mean that a tooth which could have been treated has to be removed.

The infection at the root can also flare up. The tooth then starts to hurt when you bite, the gum or the cheek swells, and a tooth abscess, a collection of pus at the root, may form. If you have swelling, a fever or severe pain that medication does not relieve, see the nearest available dentist or an urgent dental care service on the day the symptoms appear. You can come to Modern Dental & Orthodontics for further diagnosis and treatment in the days that follow.

Some symptoms mean you need to go to a hospital emergency department or call 112. These are shortness of breath, difficulty swallowing, breathing or opening your mouth, swelling that spreads to the neck, under the tongue or under the eye, or a high fever with feeling generally unwell. Without swelling, fever or severe pain that medication does not relieve, a dead tooth usually does not need a same-day visit, but treatment should not be put off for months. If the tooth hurts as well, see a dentist within a few days.

What to do when your dentist says the tooth is dead

Ask your dentist how much sound tissue will remain in the tooth and whether the bone and gum will hold it. Whether the tooth can be kept depends on these answers more than on the dead pulp itself. If both answers are favourable and the tooth is then sealed tightly, root canal treatment usually allows it to be kept for many years. Do not put off the decision, and after root canal treatment do not delay the permanent filling, onlay or crown, because delay may reduce the chance that the tooth will survive.

Frequently asked questions

Can a dead tooth start to hurt after years without symptoms?

Yes, because the infection at the root can cause no symptoms for years and then flare up suddenly. The tooth then hurts when you bite, feels higher than the others, or the gum swells. Severe pain that medication does not relieve, swelling or a fever need help on the day they appear. Other pain, without swelling or fever, is a reason to see a dentist within a few days.

Does an untreated dead tooth harm your general health?

There is no proof that a dead tooth causes heart and blood vessel disease, although studies link chronic inflammation at the root with these diseases. The infection can spread, however, so it is not wise to leave the tooth without care. Let your doctor or dentist know about a dead tooth before treatment that lowers immunity, radiotherapy to the head and neck, osteoporosis medication, a planned heart procedure, or an implant in that area. Such a tooth usually needs to be treated or removed first.

Is a filling enough for a dead tooth, without root canal treatment?

No. The dead pulp in the canals is usually infected, and a filling only seals the tooth from the top. The infection stays in the root and can go on destroying the bone around it, even if the tooth does not hurt. An antibiotic will not change this, because it does not reach the dead pulp. That is why the dentist first cleans and fills the canals, and if this cannot be done, considers removing the tooth.

Does treating a tooth with a dead pulp take more visits than treating a living tooth?

Not necessarily, because one visit is often enough, just as with a living tooth. The dentist usually plans a second visit when fluid seeps from the canal, when the inflammation at the root is pronounced, or when the canals are difficult to clean. Studies do not clearly show that one visit or several gives a better result, so the number of visits is matched to the tooth.

Is a local anaesthetic needed if the pulp is dead?

Usually yes, although the dead pulp itself feels no pain. The gum and the tissues around the root still have feeling, and when they are inflamed they can be sensitive to the pressure of instruments and to the clamp that holds a protective rubber sheet on the tooth. In a tooth with several roots, part of the pulp is sometimes still alive. The dentist talks through the anaesthetic with you before the procedure and, if anything hurts during it, can top it up.

Can an X-ray show in the first weeks after treatment whether the lesion at the root is healing?

In the first weeks an X-ray usually shows little as yet, because bone rebuilds slowly, over many months. The first follow-up X-ray of a lesion at the root tip is usually taken after 6 months, the next after a year, and healing is fully assessed after about 2 years. A large lesion may need more time, sometimes several years.

When can I bite normally on the tooth after treatment?

You can eat once the anaesthetic has worn off, at first on the other side. You can bite normally only once the tooth has been permanently sealed with a filling, an onlay or a crown. Until then, do not bite hard foods with that tooth, because its weakened walls break more easily. The tooth is sometimes tender after treatment, usually for a few days. If the pain is getting worse, or there is swelling, call your dentist the same day.

Read more:

• Root canal treatment in Warsaw
• A painless lesion at the root tip - when it is treated and when it is monitored
• Surgical crown lengthening — when is it necessary and how is it performed
• A fractured tooth root: when root canal treatment can no longer help
• Grey tooth after injury: is it dead and what improves its colour?

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

Source 1

Links https://doi.org/10.1111/iej.13490 │ https://pubmed.ncbi.nlm.nih.gov/33550601/

Description Hazard ML, Wicker C, Qian F, Williamson AE, Teixeira FB. „Accuracy of cold sensibility testing on teeth with full-coverage restorations: a clinical study.” International Endodontic Journal. 2021;54(7):1008-1015.

Source 2

Links https://doi.org/10.1111/iej.13736 │ https://pubmed.ncbi.nlm.nih.gov/35334111/ │ https://pmc.ncbi.nlm.nih.gov/articles/PMC9322405/

Description Burns LE, Kim J, Wu Y, Alzwaideh R, McGowan R, Sigurdsson A. „Outcomes of primary root canal therapy: An updated systematic review of longitudinal clinical studies published between 2003 and 2020.” International Endodontic Journal. 2022;55(7):714-731.

Source 3

Links https://doi.org/10.1016/j.jdent.2024.105071 │ https://pubmed.ncbi.nlm.nih.gov/38740248/

Description Zhang MM, Jiang LM, Liang YH. „The trend of radiographic healing after root canal treatment in teeth with apical periodontitis based on cone-beam computed tomography: A 4-year longitudinal study.” Journal of Dentistry. 2024;146:105071.

Source 4

Links https://doi.org/10.1111/iej.14116 │ https://pubmed.ncbi.nlm.nih.gov/38949036/

Description Patel SR, Jarad F, Moawad E, Boland A, Greenhalgh J, Liu M, et al. „The tooth survival of non-surgical root-filled posterior teeth and the associated prognostic tooth-related factors: A systematic review and meta-analysis.” International Endodontic Journal. 2024;57(10):1404-1421.

Source 5

Links https://doi.org/10.1016/j.joen.2026.07.004 │ https://pubmed.ncbi.nlm.nih.gov/42431504/

Description Haupt F, Mielke TE, Hausdörfer T, Wiegand A, Kanzow P. „Long-Term Survival of Primary Root Canal Treatment Following Indirect Cuspal Coverage Restoration in Posterior Teeth: A 10-year Retrospective Study.” Journal of Endodontics. 2026;52(10):1598-1604.

Source 6

Links https://doi.org/10.1016/j.joen.2023.12.002 │ https://pubmed.ncbi.nlm.nih.gov/38141831/

Description Kim DH, Tawil PZ, Albouy JP, Duqum I. „Retrospective Assessment of Endodontically Treated Teeth Replaced by Dental Implants.” Journal of Endodontics. 2024;50(3):310-315.

Source 7

Links https://doi.org/10.1111/iej.13392 │ https://pubmed.ncbi.nlm.nih.gov/32871615/

Description Kebke S, Fransson H, Brundin M, Mota de Almeida FJ. „Tooth survival following root canal treatment by general dental practitioners in a Swedish county – a 10-year follow-up study of a historical cohort.” International Endodontic Journal. 2021;54(1):5-14.

Source 8

Links https://doi.org/10.1007/s00784-023-04938-y │ https://pubmed.ncbi.nlm.nih.gov/36933044/ │ https://pmc.ncbi.nlm.nih.gov/articles/PMC10264502/

Description López-Valverde I, Vignoletti F, Vignoletti G, Martin C, Sanz M. „Long-term tooth survival and success following primary root canal treatment: a 5- to 37-year retrospective observation.” Clinical Oral Investigations. 2023;27(6):3233-3244.

Source 9

Links https://doi.org/10.1111/jcpe.13290 │ https://pubmed.ncbi.nlm.nih.gov/32383274/ │ https://pmc.ncbi.nlm.nih.gov/articles/PMC7891343/

Description Sanz M, Herrera D, Kebschull M, Chapple I, Jepsen S, Berglundh T, et al. „Treatment of stage I–III periodontitis—The EFP S3 level clinical practice guideline.” Journal of Clinical Periodontology. 2020;47(Suppl 22):4-60.

Source 10

Links https://doi.org/10.1016/j.jdent.2025.105943 │ https://pubmed.ncbi.nlm.nih.gov/40588073/

Description Talekar AW, Abraham D, Puri A, Gupta A, Singal K, Neha N. „Association between cardiovascular diseases and apical periodontitis: An umbrella review with stratification of evidence and sensitivity analysis.” Journal of Dentistry. 2025;161:105943.