What Is a Root Canal? A Complete Guide
A root canal is the narrow channel inside a tooth root that holds the pulp — the tooth's nerve and blood supply. Root canal therapy removes pulp that has become infected or inflamed, then cleans and seals those channels so a tooth that might otherwise need extraction can be kept. Treatment usually takes one to two appointments of about 60 to 90 minutes, and a crown is often placed afterwards because a treated tooth is more brittle without its living tissue.
Orion Dental Team
Led by Dr. Fahimay Naqvi
The term “root canal” actually refers to a part of your tooth's anatomy— the narrow channel inside the root that contains the pulp (nerve and blood supply). When people say “root canal,” they're usually referring to root canal therapy (also called endodontic treatment), the procedure used to treat infection or damage inside the tooth.
At Orion Dental in Scarborough and Milton, we perform root canal therapy regularly. It's a routine procedure that can save a tooth that might otherwise need to be extracted. This guide covers everything you need to know — from the anatomy of your tooth to what happens during and after treatment.
Well-established
treatment option
1–2
appointments needed
60–90 min
per appointment
Designed
to save your natural tooth
Understanding Your Tooth's Anatomy
To understand why root canals are needed, it helps to know the basic structure of a tooth:
Enamel
The hard, white outer layer that protects the tooth. It's the hardest substance in the human body.
Dentin
The layer beneath the enamel. It's softer and forms the bulk of the tooth structure.
Pulp
The innermost part of the tooth containing nerves, blood vessels, and connective tissue. It nourishes the tooth during development.
Root Canal(s)
The narrow channel(s) inside each root that house the pulp tissue. Molars typically have 2–4 canals; front teeth usually have one.
While the pulp is essential during tooth development, a fully developed adult tooth can survive without its pulp. The tooth continues to receive nourishment from the surrounding tissues. This is what makes root canal therapy possible — the infected pulp can be removed while the tooth itself is preserved.
When Is a Root Canal Needed?
Root canal therapy is recommended when the pulp inside your tooth becomes infected or irreversibly inflamed. This can happen due to:
Common Causes of Pulp Damage
- Deep decay (a cavity that has reached the pulp)
- A crack or fracture in the tooth
- Repeated dental procedures on the same tooth
- Trauma or injury to the tooth (even without visible damage)
- A large filling that has compromised the tooth structure
Signs You May Need a Root Canal
Some teeth with pulp damage show no symptoms at all, which is why regular dental checkups and X-rays are important. However, common signs include:
Warning Signs
- Persistent or severe toothache — especially pain that wakes you at night
- Prolonged sensitivity to hot or cold that lingers after the source is removed
- Pain or tenderness when biting or chewing
- Swelling or tenderness in the gums near the affected tooth
- A darkening or discolouration of the tooth
- A pimple-like bump (fistula) on the gum near the tooth
- A chipped or cracked tooth with deep damage
Don't Ignore These Symptoms
If you experience any of these symptoms, contact your dentist promptly. A dental infection will not resolve on its own and can worsen significantly if left untreated. In some cases, what seems like a mild toothache can progress to a dental emergency.
What Happens During a Root Canal
Root canal therapy is a routine dental procedure that most patients compare to having a filling placed. The treatment is performed under local anesthesia, so you should not feel pain during the procedure. Here is what happens step by step:
The Root Canal Procedure — Step by Step
Anesthesia & Isolation
The tooth and surrounding area are numbed with local anesthesia. A rubber dam is placed to keep the tooth dry and isolated from saliva.
Access Opening
Your dentist creates a small opening in the crown of the tooth to access the pulp chamber and root canals.
Pulp Removal
Using specialised instruments, the infected or inflamed pulp tissue is carefully removed from the pulp chamber and root canals.
Cleaning & Shaping
The empty canals are thoroughly cleaned, shaped, and disinfected with antimicrobial solutions to eliminate bacteria.
Filling the Canals
The cleaned canals are filled with a biocompatible material called gutta-percha and sealed with dental cement to prevent re-infection.
Restoration
A temporary filling is placed initially. A permanent restoration — usually a dental crown — is placed at a follow-up appointment to protect and strengthen the tooth.
Experiencing Tooth Pain?
Don't wait. Book an appointment to have it evaluated before the problem worsens.
Does a Root Canal Hurt?
This is the question most patients ask first — and the answer may surprise you. Modern root canal therapy is far more comfortable than its reputation suggests. With effective local anesthesia and modern techniques, most patients feel little to no discomfort during the procedure itself.
In fact, the root canal relieves pain rather than causing it. The pain patients experience before treatment comes from the infected or inflamed pulp. By removing the source of infection, root canal therapy eliminates that pain.
After the procedure, it is normal to experience mild tenderness or sensitivity for a few days, which can typically be managed with over-the-counter pain medication. If you experience dental anxiety, talk to your dentist about sedation options that can help you feel more comfortable.
Pain Is the Reason — Not the Result
The discomfort you feel before a root canal is caused by the infection. The procedure itself removes the source of that pain. Most patients report significant relief within 24 to 48 hours of treatment.
Recovery and Aftercare
Recovery from root canal therapy is typically straightforward. Here is what to expect and how to care for your tooth after the procedure:
Post-Treatment Care
- Avoid chewing on the treated side until the permanent restoration (crown) is placed
- Follow your dentist's instructions regarding over-the-counter pain relief
- Eat soft foods for the first day or two after treatment
- Continue brushing and flossing normally, being gentle around the treated area
- Take any prescribed antibiotics as directed if infection was present
- Attend your follow-up appointment for the permanent crown placement
- Contact your dentist if you experience severe pain, swelling, or fever
Root Canal vs Tooth Extraction: Which Is Preferred?
When a tooth is severely damaged, you may wonder whether it's better to save it with a root canal or extract it and replace it with an implant or bridge. In general, preserving your natural tooth is preferred whenever possible.
| Consideration | Root Canal + Crown | Extraction + Replacement |
|---|---|---|
| Preserves Natural Tooth | Yes | No — tooth is removed |
| Treatment Time | 1–2 appointments | Multiple steps over months (extraction, healing, implant, crown) |
| Adjacent Teeth Affected | No | Bridge: yes. Implant: no |
| Bone Preservation | Natural root maintains bone | Implant preserves bone; bridge does not |
| Cost | Generally lower total cost | Implant + crown is typically more expensive |
| Longevity | Many years with proper care | Implant: decades. Bridge: 7–15 years |
| When Preferred | Tooth can be adequately restored | Tooth is too damaged to save |
Your dentist will always discuss whether a tooth can be saved before recommending extraction. When extraction is necessary, options like dental implants, bridges, or dentures can restore function and appearance.
Why You Need a Crown After a Root Canal
After root canal therapy, the treated tooth is more brittle than a healthy tooth because the living tissue has been removed. A dental crown provides the strength and protection needed to prevent fracture and restore the tooth to full function.
The crown is custom-made to match the colour, shape, and size of your natural teeth. Modern dental crowns are crafted from durable materials such as porcelain, zirconia, or porcelain-fused-to-metal, providing both strength and a natural appearance. Your dentist will recommend the material that is most appropriate for the location and function of the tooth.
How to Reduce Your Risk of Needing a Root Canal
While not all root canals are preventable (especially those caused by trauma), good oral habits significantly reduce your risk:
Brush Twice Daily
Use a soft-bristle toothbrush and fluoride toothpaste. Pay particular attention to the gum line where bacteria accumulate.
Floss Every Day
Flossing removes plaque and food from between teeth and below the gum line where your toothbrush cannot reach.
Regular Dental Visits
Professional cleanings and exams catch decay early — before it has a chance to reach the pulp.
Treat Cavities Promptly
A small cavity today can become a root canal tomorrow. Don't delay treatment for known issues.
Wear a Mouth Guard
If you play contact sports or grind your teeth at night, a custom guard protects against fracture and trauma.
Limit Sugary Foods
Sugar feeds the bacteria that cause decay. Reducing your intake — especially between meals — lowers your risk.
Don't Wait — Get the Care You Need
Root canal therapy is a safe, effective, and routine procedure that can save your natural tooth and relieve pain caused by infection. If you're experiencing symptoms or have been told you need a root canal, our team at Orion Dental is here to guide you through the process with care and transparency.
We offer root canal therapy and crown restorations at both of our convenient locations. For patients with dental anxiety, we also provide sedation options to help you feel comfortable throughout treatment.
Schedule an appointment at our Scarborough or Milton office. Book an appointment or call 416-291-0306 (Scarborough) / 905-636-9770 (Milton).
Frequently Asked Questions
Common questions about root canal therapy
Is a root canal painful?
Modern root canal procedures are performed under local anesthesia, and most patients report that the experience is comparable to having a filling placed. The procedure actually relieves the pain caused by the infected or inflamed pulp. Some mild soreness after treatment is normal and typically resolves within a few days.
How long does a root canal take?
Most root canals are completed in one to two appointments, each lasting approximately 60 to 90 minutes. The number of visits depends on the tooth involved and the complexity of the root canal system. Front teeth typically require less time than molars.
What happens if I don't get a root canal when I need one?
An untreated infected tooth can lead to worsening pain, abscess formation, spread of infection to surrounding tissues or bone, and ultimately tooth loss. In rare cases, a severe dental infection can affect your overall health. Early treatment is generally recommended.
How long does a root canal treated tooth last?
A tooth that has received proper root canal therapy and been restored with a crown can last for many years — often as long as your natural teeth. Regular dental checkups and good oral hygiene are important for long-term success.
Will I need a crown after a root canal?
In most cases, yes. A tooth that has undergone root canal therapy is more brittle because the living tissue has been removed. A dental crown protects the tooth from fracture and restores its full function and appearance. Front teeth may sometimes be restored with a filling alone.
Can a root canal fail?
While root canals have a high success rate, re-infection can occasionally occur — particularly if the original infection was severe, if a canal was missed, or if the restoration fails. If this happens, retreatment or a minor surgical procedure (apicoectomy) may be recommended.
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