Inside every tooth is a soft core called the pulp, which holds the tooth’s nerve and blood supply. When the pulp becomes inflamed or infected, usually from deep decay, a crack or an injury, it cannot heal on its own. A root canal removes the damaged pulp, cleans the inside of the tooth and seals it, so you can keep your natural tooth.
Here are the signs that point to a problem with the pulp, and an honest answer to the question many people are really asking.
Signs you may need a root canal
1. Sensitivity that lingers
A quick twinge from something cold that disappears in a second or two is usually not serious. Sensitivity to hot or cold that lingers for 30 seconds or more after the food or drink is gone suggests the nerve is inflamed.
2. Toothache that comes on by itself
Pain that starts without any trigger, throbs, or wakes you at night is a common sign of an inflamed or dying nerve.
3. Pain when you bite or chew
Tenderness when pressure is placed on a tooth can mean infection has reached the tissues around the root.
4. A swollen gum or a pimple on the gum
A small bump on the gum near a tooth, sometimes with a bad taste or pus, is often a sign of an abscess draining from an infected root.
5. A tooth that is darkening
A tooth that turns grey or darker than its neighbours, often after an injury, may have a nerve that is dying.
6. Deep decay, a crack or past trauma
Large cavities, cracked teeth and teeth that were knocked years ago are more likely to develop pulp problems.
7. Sometimes, no symptoms at all
Some infected teeth cause no pain. The problem is only found on an X-ray at a routine checkup. This is one reason regular exams matter.
None of these signs confirms you need a root canal on its own. Your dentist will test the tooth and take X-rays to find out whether the pulp can recover or needs treatment.
When it is urgent
Call a dentist the same day if you have:
- Swelling of the face, jaw or neck
- A fever with tooth pain
- Pain that over-the-counter medication does not control
- Difficulty swallowing or opening your mouth
These can be signs of a spreading infection. See our emergency dentistry page for what to do.
Does a root canal hurt?
For many people, the honest answer is: not much more than a filling. The tooth is thoroughly numbed before treatment starts, and many people feel pressure and vibration rather than pain.
The painful part is usually the infection itself, before treatment. Removing the inflamed or infected pulp is what relieves that pain.
Afterwards, the tooth and gum are often tender for a few days, especially when biting. This is normal and usually manageable with over-the-counter pain relief as your dentist advises.
If you feel anxious about dental treatment, tell us. We can talk through each step, go at your pace and discuss sedation options if they would help.
Root canal or extraction?
Removing the tooth can seem simpler, but it is rarely the conservative choice.
| Root canal | Extraction | |
|---|---|---|
| Keeps your natural tooth | Yes | No |
| Effect on nearby teeth | None | Neighbouring teeth can drift into the gap |
| Further treatment | Usually a crown | Often a bridge or implant to replace the tooth |
| Long-term | A treated tooth can last many years | Bone in the area shrinks without a tooth root |
Extraction is sometimes the right option, for example when a tooth is split below the gumline or cannot be restored. But when a tooth can be saved, keeping it usually protects your bite and your long-term oral health.
Root canal care at Vigée Dental
We take a conservative approach: save the natural tooth wherever that is realistic, and explain every option clearly. You will receive a written estimate before treatment begins. Learn more about root canal therapy, read how long a root canal takes, or book an appointment online.
Frequently asked questions
Can a tooth that needs a root canal heal on its own?
No. Once the pulp is badly inflamed or infected, it cannot recover. The pain may come and go, but the infection remains and can spread.
Can antibiotics fix a tooth that needs a root canal?
Antibiotics can help control a spreading infection, but they cannot reach the inside of the tooth well enough to cure it. The source of the infection still needs treatment.
What happens if I wait?
The infection can spread to the bone and surrounding tissues, cause an abscess, and make the tooth harder or impossible to save.
Will my tooth look different after a root canal?
Usually not. A tooth that was darkened by a dying nerve can often be whitened or restored so it matches its neighbours.