Root Canal Therapy is a dental procedure that removes infected or inflamed tissue from inside a tooth to relieve pain, treat infection and preserve the natural tooth. It is often recommended when deep decay, a crack or an injury has damaged the tooth’s inner tissue.
A root canal for an infected tooth can help prevent the need for extraction when enough healthy tooth structure remains. Modern techniques and local anaesthesia make the procedure more comfortable than many patients expect.
Understanding how root canal treatment works, when it is necessary and what recovery involves can help you make an informed decision about your dental care.
This guide explains the signs of tooth pulp infection, common causes, treatment steps and the benefits of saving a natural tooth.
Signs You May Need Root Canal Therapy
Root canal therapy may be necessary when the soft tissue inside a tooth becomes severely inflamed, infected or damaged beyond its ability to recover.
This inner tissue, called the dental pulp, contains nerves, blood vessels and connective tissue. When bacteria reach the pulp or an injury damages it, the tooth may develop pain, sensitivity or infection.
According to the Canadian Dental Association’s guidance on root canal treatment, the procedure removes infected or injured pulp and can help preserve a tooth that might otherwise require extraction.
Persistent or Severe Tooth Pain
A persistent toothache is one of the most common reasons patients seek treatment.
Pain may feel sharp, throbbing or constant. It can worsen when chewing, biting or lying down.
However, not every toothache requires a root canal. Cavities, gum problems and other dental conditions can cause similar symptoms.
A professional examination is needed to identify the source of discomfort.
Prolonged Sensitivity to Hot or Cold
Brief sensitivity to temperature changes does not always indicate a serious dental problem.
However, discomfort that continues after a hot or cold food or drink has been removed may suggest inflammation inside the tooth.
Sensitivity that becomes more intense or occurs without an obvious trigger should be examined.
Swollen or Tender Gums
Swelling around a tooth may indicate an infection involving the pulp or surrounding tissues.
Other warning signs include:
- A small, pimple-like bump on the gum
- Tenderness when touching or biting on the tooth
- A persistent unpleasant taste in the mouth
- Swelling around the jaw or face
- Pain that spreads towards the ear or surrounding teeth
These symptoms may indicate a dental abscess, which requires prompt professional assessment.
Tooth Discolouration After Injury
A tooth that becomes grey or noticeably darker after an injury may have experienced damage to its pulp.
However, colour changes do not always mean a root canal is required.
Your dentist may recommend diagnostic tests and dental X-rays to determine whether the pulp is healthy or whether treatment is necessary.
When Should You Seek Emergency Dental Care?
Severe tooth pain, facial swelling or signs of infection should not be ignored.
The Ontario Dental Association’s guidance on dental emergencies recommends contacting a dentist promptly when you experience constant or severe dental pain.
Tomken Dental provides Emergency Dentistry in Mississauga for urgent concerns, including severe toothaches, dental abscesses and damaged teeth.
If swelling causes difficulty breathing or swallowing, or you develop rapidly worsening facial or neck swelling, seek emergency medical attention immediately.
Common Causes of Tooth Pulp Infection
Tooth pulp infection often develops when bacteria enter the inner portion of a tooth through deep decay, cracks or damaged restorations.
The pulp sits beneath the protective enamel and dentine layers. When these outer structures become damaged, the pulp may become exposed to irritation or bacteria.
Deep Tooth Decay
Untreated cavities can gradually extend through the outer layers of the tooth.
When decay reaches the pulp, it may cause severe inflammation or bacterial infection.
A small cavity may be treated with a filling, but a tooth with extensive pulp damage may require root canal treatment to preserve it.
Cracked or Fractured Teeth
A crack can provide a pathway for bacteria to enter the inner tooth structure.
Even a small fracture may cause discomfort when chewing or expose the pulp to irritation.
Some cracks can be treated with restorations, while deeper fractures may require endodontic treatment.
If a fracture extends too far below the gumline or into the root, saving the tooth may not be possible.
Repeated Dental Procedures
Teeth that have undergone several restorative procedures may experience pulp irritation over time.
Large fillings, repeated drilling or damage around existing restorations can contribute to inflammation.
If the pulp becomes irreversibly inflamed, root canal therapy may be recommended.
Dental Trauma
A fall, sports injury or accident can damage the pulp even when the tooth has no visible crack.
Trauma may interrupt the pulp’s blood supply, potentially causing the tissue to deteriorate.
A dentist can assess the injured tooth and monitor whether treatment is required.
Can a Tooth Infection Heal Without Treatment?
An infected tooth pulp generally cannot recover without professional treatment once the tissue has become irreversibly damaged.
Pain may temporarily improve if the pulp dies, but this does not mean the infection has disappeared.
The Canadian Dental Association’s recommendations on antibiotics and dental treatment explain that root canal treatment or extraction is usually needed to remove the source of a localised dental abscess. Antibiotics are not routinely required unless particular medical or infection-related factors are present.
Delaying treatment can allow an infection to affect surrounding tissues and make the tooth more difficult to save.
How Root Canal Treatment Works
Root canal treatment works by removing damaged pulp, cleaning and disinfecting the root canals, and sealing the space to reduce the risk of further infection.
The tooth is then restored with a filling or crown to protect its remaining structure.
Most straightforward treatments can be completed in one or two appointments, although complex cases may require additional visits.
Step 1: Dental Examination and Diagnosis
Your dentist begins by examining the affected tooth and reviewing your symptoms.
The assessment may involve:
- Dental X-rays to examine the roots and surrounding bone
- Testing the tooth’s response to hot or cold
- Checking for tenderness when biting
- Examining the gums for swelling or infection
- Evaluating whether the tooth can be restored
The findings help determine whether a root canal is appropriate or whether another treatment would be more suitable.
Tomken Dental offers Root Canal Therapy in Mississauga, with clinical examinations and diagnostic imaging used to assess the affected tooth before treatment.
Step 2: Numbing and Isolating the Tooth
Before the procedure begins, your dentist administers local anaesthesia to numb the treatment area.
A thin protective sheet, called a rubber dam, is placed around the tooth.
This keeps the treatment area isolated from saliva and helps prevent bacteria from entering the tooth during the procedure.
Patients may notice pressure or vibration, but the anaesthetic is intended to prevent sharp pain.
Step 3: Removing the Infected Pulp
The dentist creates a small opening in the tooth to access the pulp chamber.
Specialised instruments are used to remove the inflamed or infected pulp from the chamber and root canals.
The canals are then carefully cleaned, shaped and disinfected.
The goal is to remove damaged tissue and reduce bacteria within the root canal system.
Step 4: Filling and Sealing the Root Canals
Once the canals have been cleaned and prepared, the dentist fills them with a biocompatible material, commonly gutta-percha.
The canals are sealed to help prevent bacteria from re-entering the treated spaces.
A temporary or permanent filling is then placed over the opening.
According to the American Association of Endodontists’ explanation of root canal procedures, cleaning, filling and sealing the canals are central steps in preserving the treated tooth.
Step 5: Restoring the Tooth
A tooth often needs additional protection after root canal treatment, particularly if it has lost substantial natural structure.
A dental crown may be recommended to restore strength, shape and chewing function.
Back teeth commonly benefit from crowns because they experience greater chewing forces.
However, some front teeth with sufficient remaining structure may be restored with fillings instead.
Tomken Dental provides same-day crowns and bridges and can discuss suitable restoration options following treatment.
For more information, read the clinic’s guide on whether you need a crown after a root canal.
Recovery and Aftercare Following Treatment
Recovery after root canal treatment is usually manageable, with many patients experiencing mild tenderness for several days.
Most people can return to normal daily activities shortly after treatment, although the tooth and surrounding tissues may need additional time to settle.
Following your dentist’s instructions helps protect the treated tooth and supports healing.
What to Expect During the First Few Days
After treatment, you may experience:
- Mild soreness around the treated tooth
- Tenderness when biting or chewing
- Temporary sensitivity in the surrounding gums
- A different sensation when the treated tooth contacts other teeth
These symptoms generally improve as the surrounding tissues recover.
The Canadian Dental Association explains that tenderness can occur during the first week or two, but severe pain or swelling is not typical.
Avoid Chewing on the Treated Tooth
If your tooth has a temporary filling or has not yet received its permanent restoration, avoid biting into hard or sticky foods with that tooth.
A heavily damaged tooth may be more vulnerable to fracture until it has been properly restored.
Choose softer foods if chewing feels uncomfortable and follow your dentist’s instructions about when normal chewing can resume.
Maintain Good Oral Hygiene
Continue brushing twice daily with fluoride toothpaste and cleaning between your teeth.
Be gentle around the treated area, particularly if the gums feel tender.
Root canal treatment removes the pulp, but it does not prevent future tooth decay or gum disease.
Good daily hygiene remains necessary to protect the tooth and surrounding tissues.
Manage Discomfort Appropriately
Your dentist may recommend suitable over-the-counter pain relief or prescribe medication when needed.
Follow the recommended dosage and discuss any existing medical conditions or medications that could affect your treatment.
Avoid placing pain-relieving tablets directly against the tooth or gums because this can irritate or damage the tissues.
Attend Your Follow-Up Appointment
Follow-up care allows your dentist to check healing and confirm whether further restoration is needed.
If a crown is recommended, arrange the appointment promptly rather than leaving the tooth with a temporary restoration for an extended period.
The final restoration plays an important role in protecting the treated tooth from further damage.
When Should You Contact Your Dentist After a Root Canal?
Contact your dentist if you experience severe or worsening pain, increasing swelling, fever, a lost temporary filling or a bite that feels unusually high.
These symptoms may indicate that additional assessment or treatment is needed.
Do not wait for a routine appointment if you develop signs of a spreading infection.
Root Canal Treatment vs Tooth Extraction
Root canal treatment aims to save a damaged or infected natural tooth, while tooth extraction removes the tooth entirely.
Both procedures can address serious dental problems, but the best option depends on the condition of the tooth and whether it can be restored successfully.
Comparing Root Canal Treatment and Tooth Extraction
| Factor | Root Canal Treatment | Tooth Extraction |
| Primary purpose | Remove damaged pulp and preserve the tooth | Remove a tooth that cannot or will not be retained |
| Natural tooth | Remains in place | Is removed |
| Treatment process | Canals are cleaned, filled and sealed | Tooth is removed from its socket |
| Additional restoration | A filling or crown may be required | An implant, bridge or denture may be considered |
| Healing | Usually involves temporary tenderness | Requires healing of the gum and extraction socket |
| Long-term care | Regular hygiene and restoration maintenance | Possible tooth replacement and related maintenance |
Benefits of Saving Your Natural Tooth
When the tooth can be restored predictably, root canal treatment offers several benefits.
These include:
- Preserving natural tooth structure: The tooth remains in its original position.
- Maintaining chewing function: A properly restored tooth can continue to support normal biting and chewing.
- Avoiding a gap: Keeping the tooth reduces the need to plan for replacement after extraction.
- Supporting bite stability: Retaining the tooth helps maintain contact with neighbouring and opposing teeth.
- Reducing additional treatment: A successful root canal may avoid the need for an implant, bridge or removable replacement.
The American Association of Endodontists outlines the benefits of preserving natural teeth, including maintaining chewing ability and limiting the need for additional restorative procedures.
When Is Tooth Extraction Necessary?
Extraction may be recommended when the tooth cannot be predictably saved.
Examples include:
- Severe decay extending beyond the tooth’s restorable structure
- A vertical root fracture
- Extensive damage beneath the gumline
- Advanced periodontal disease affecting tooth support
- Infection that cannot be successfully managed while retaining the tooth
Tomken Dental offers Tooth Extractions when a tooth is too damaged or infected to preserve.
If extraction is necessary, your dentist can discuss replacement options, including dental implants, bridges and dentures.
Which Treatment Is Better for an Infected Tooth?
Root canal treatment is generally preferred when an infected tooth can be saved and restored with a reasonable long-term outlook.
Extraction may be more appropriate when severe structural damage or other clinical problems make retaining the tooth unlikely to succeed.
Treatment decisions should account for the condition of the roots, remaining tooth structure, gum health and restorative needs.
The overall cost may also vary depending on the complexity of the root canal, whether a crown is required and whether an extracted tooth needs replacement.
Patients comparing treatment expenses can review the clinic’s root canal cost guide for Mississauga to understand the factors that may influence the cost.
A dental examination is the most reliable way to determine which treatment is appropriate.
Frequently Asked Questions About Root Canal Therapy
Is a root canal painful?
Root canal treatment is generally performed under local anaesthesia, which numbs the tooth and surrounding area. Most patients feel pressure or vibration rather than sharp pain during the procedure. Mild tenderness for several days afterwards is common, but severe or worsening pain should be assessed by a dentist.
How long does the procedure take?
At Tomken Dental, a root canal appointment typically takes approximately 60 to 90 minutes. Some teeth can be treated in one visit, while others require two or more appointments. Treatment duration depends on the tooth’s location, the number of root canals and the complexity of the infection.
Can a treated tooth become infected again?
Yes. A root canal-treated tooth can become infected again if bacteria enter through new decay, a damaged restoration or an untreated canal. The American Association of Endodontists explains that retreatment may help save a tooth that develops problems after its original procedure. Extraction may be necessary if the tooth cannot be successfully retreated.
Is a crown needed after treatment?
A crown is often recommended after root canal treatment, particularly for molars and premolars that experience strong chewing forces. However, not every treated tooth requires a crown. Some front teeth may be restored with fillings if enough healthy structure remains. Your dentist will recommend an appropriate restoration based on the tooth’s condition and function.
How long does a root canal-treated tooth last?
A properly treated and restored tooth can last for many years and may remain functional for a lifetime. Longevity depends on the amount of remaining tooth structure, the quality of the restoration, oral hygiene and regular dental care. Teeth with extensive fractures or recurring infections may have a less favourable long-term outlook.
Protect Your Natural Smile With Root Canal Therapy
Root Canal Therapy is an established treatment for teeth affected by severe pulp inflammation, infection or internal damage.
By removing diseased tissue and restoring the tooth, root canal treatment can relieve discomfort, preserve natural tooth structure and help maintain normal chewing function.
The decision between root canal treatment and extraction should always be based on a professional examination and the long-term outlook for the affected tooth.
For patients searching for a Dentist in Mississauga, Tomken Dental offers root canal treatment, restorative care and urgent dental assessments for painful or infected teeth.
Experiencing persistent tooth pain or worried about an infected tooth? Request a dental appointment at Tomken Dental to identify the cause, discuss tooth-saving treatment options and receive guidance on the next steps for your oral health.