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Root Canal Treatment: Why It Is Needed and What Really Happens
Root canal treatment removes inflamed, infected or damaged pulp from inside a tooth. The dentist then cleans, shapes and seals the canals, and the tooth receives a filling or crown. The aim is to keep a tooth that might otherwise need to be removed when clinically possible.
Many people feel anxious about root canal treatment, especially after an ongoing toothache or stories about pain. At Marsfield Dental Care, as at most practices, the procedure is carried out under local anaesthetic and aims to treat the problem causing the pain. Symptoms, the number of appointments, recovery and outcomes vary from person to person.
This guide covers why treatment is needed, the warning signs, each stage of the procedure, what it feels like, recovery and what affects the cost.
What is root canal treatment, and why is it necessary?
Root canal treatment is recommended when the pulp inside a tooth is permanently inflamed, infected or damaged, but the tooth can still be restored. The dentist removes the affected pulp, disinfects the canals, seals them, and then rebuilds the tooth with a filling or crown. The goal is to keep your natural tooth rather than extract it, where that is a sound option.
Inside a tooth
A tooth has a hard outer layer called enamel. Beneath it sits dentine, and in the centre is the pulp, which holds nerves and blood vessels. The pulp extends down through the roots in narrow channels called root canals. Bacteria can reach the pulp through deep decay, cracks or damage.
Common reasons for treatment
The Australian Government’s healthdirect guide to root canal treatment lists tooth decay, injury, a crack, and repeated dental work as situations in which the pulp can be harmed. Infection can also spread to the tissues around the root.
What treatment aims to do
Treatment removes the affected pulp, disinfects the canals and allows the tooth to be restored. Antibiotics alone do not cure an infection inside the root canal, because they cannot reach tissue that has lost its blood supply.
| Dental condition | Possible treatment | Important qualification |
| Minor decay | Filling | Depends on depth |
| Reversible pulp inflammation | Conservative treatment | Needs diagnosis |
| Irreversible pulp damage | Root canal treatment | The tooth must be restorable |
| Severe tooth destruction | Root canal or extraction | Remaining structure matters |
| Non-restorable tooth | Extraction | Discuss replacement options |
Root canal treatment or extraction?
Extraction removes the tooth, while root canal treatment aims to keep it. Keeping a badly damaged tooth is not always the best choice, so your dentist should explain both options, including what replacing an extracted tooth entails. You can read more about root canal therapy at our Marsfield practice.
What are the common signs that you need root canal treatment?
Persistent toothache, lingering sensitivity to hot or cold, swelling near a tooth, or pain when biting can all point to pulp inflammation or infection. None of these symptoms confirms that you need root canal treatment on its own, because other problems can cause them too. Some infected teeth cause few symptoms, so a dental examination and testing are needed.
Persistent or severe toothache
Pain may throb, wake you at night, start without a clear trigger, or be hard to pin to one tooth. How much it hurts does not reliably show how serious the problem is.
Sensitivity to hot and cold
Brief sensitivity that fades within seconds often has other causes, such as exposed dentine or a worn filling. Pain that lingers after consuming a hot drink or cold food may suggest that the pulp is involved.
Swelling and signs of infection
Healthdirect lists toothache, sensitivity to temperature, swelling, a darkening of the tooth’s colour, and a pimple-like bump near the tooth as possible signs of a root canal infection. Bad taste, drainage or tenderness when biting can also occur.
| Symptom | Possible explanation | Recommended action |
| Persistent toothache | Pulp inflammation or another problem | Dental examination |
| Lingering temperature sensitivity | Possible pulp involvement | Pulp testing |
| Pain when biting | Tooth or tissue problem | Clinical assessment |
| Gum swelling | Possible infection | Prompt assessment |
| Gum bump or drainage | Possible abscess | Prompt treatment |
| Tooth darkening | Trauma or pulp changes | Dental evaluation |
| Few or no symptoms | Disease may still be present | Assessment where indicated |
When symptoms are urgent
Increasing facial swelling, fever, or signs of spreading infection require an urgent dental assessment. Difficulty breathing or swallowing, or swelling affecting the airway, needs emergency medical care: call 000. Don’t delay care because pain eases for a while. See our dental emergency page for urgent appointments during opening hours.
What happens during a root canal treatment procedure?
Root canal treatment usually involves diagnosing the problem, numbing the tooth, isolating it with a rubber sheet, opening the tooth, removing the affected pulp, cleaning and sealing the canals, and then restoring the tooth with a filling or crown. Some teeth are finished in one visit, while others need medicine placed in the canals between appointments.
Stage 1: Consultation and diagnosis
Your dentist reviews your history and symptoms, examines the tooth, may test how the pulp responds and takes X-rays where needed. They should then discuss your options, risks, and costs.
Stage 2: Local anaesthetic
Local anaesthetic numbs the tooth and the surrounding area. It works differently for different people, and inflamed teeth sometimes need extra measures. Tell your dentist beforehand if you have struggled to get numb in the past.
Stage 3: Isolation
A thin rubber sheet, called a rubber dam, is usually placed around the tooth to keep it clean and dry.
Stage 4: Access
The dentist makes a small opening in the top of the tooth to reach the pulp chamber and canals.
Stage 5: Cleaning and shaping
The affected pulp is removed, and the canals are cleaned, shaped and disinfected. Curved or complex canals take more time. If needed, medicine and a temporary filling are placed between visits.
Stage 6: Root filling
The cleaned canals are filled and sealed to lower the risk of bacteria getting back in.
Stage 7: Restoration
A permanent filling or crown protects the tooth. At our practice, back teeth usually need a crown, while front teeth with limited damage may be restored with a filling.
When a specialist may help
A general dentist completes many root canal treatments. Complex cases, such as unusual canal shapes or retreatment of a previously treated tooth, may be referred to an endodontist, a dentist with specialist registration in root canal treatment.
Is root canal treatment painful, and what should you expect?
Root canal treatment is done under local anaesthetic, so most people feel pressure and vibration rather than sharp pain, although experiences vary. Some tenderness for a few days afterwards is common, especially if the tooth was badly inflamed beforehand. The treatment aims to relieve the problem causing the pain, not add to it.
During treatment
Expect pressure and vibration. If you feel discomfort, raise a hand, and your dentist can pause or give more anaesthetic. If you feel nervous, these tips for easing nerves before a dental visit may help.
After treatment
Mild tenderness or soreness when biting for a few days is common. Ask your dentist which pain relief suits you, and contact the clinic if the pain increases rather than settles.
Common beliefs about root canal treatment
| Common belief | What to know |
| Root canals are always painful | Local anaesthetic is used, and experiences vary |
| Extraction is always better | It depends on the tooth and your preferences |
| Root canals always need many visits | Some need one, others more |
| A treated tooth cannot fail | Reinfection and complications can occur |
| Antibiotics can replace treatment | Antibiotics don’t remove infected pulp |
How long does root canal treatment take, and what is recovery like?
Root canal treatment may be completed in one appointment or may require several, depending on the tooth, the infection, and the restoration. At Marsfield Dental Care, most cases are completed in one or two appointments of about 45 minutes to over an hour, often with a further visit for a crown. Numbness lasts a few hours, and soreness usually eases over a few days.
What affects treatment time
A molar usually has more canals than a front tooth. Curved canals, a serious infection, previous root canal treatment or the need for a crown can all add time or visits. Exact timing can’t be promised in advance.
Immediately after
Numbness may last a few hours. Avoid chewing until it wears off so you don’t bite your cheek or tongue. Protect any temporary filling and follow your dentist’s advice.
The first few days
Soreness usually improves over a few days. Keep brushing and cleaning gently, use suitable pain relief and avoid heavy chewing on the tooth until it is fully restored. Attend any review or crown appointments so the tooth is protected long-term.
When to contact the dentist
Call the practice if pain increases, swelling develops, your bite feels off, or a temporary filling falls out. Difficulty breathing or swallowing needs emergency care: call 000.
What affects the cost of root canal treatment?
Root canal treatment costs depend on the tooth, how many canals it has, how complex the infection is, how many appointments are needed and whether a filling or crown is needed afterwards. An advertised root canal price may not include the examination, X-rays or the final restoration, so compare complete plans rather than single line items.
The main factors are:
- Tooth type: front teeth often have simpler canals than molars, though canal numbers vary.
- Complexity: curved canals or retreatment take longer.
- Diagnosis: consultation, tests and X-rays.
- Extra visits: temporary fillings or medicated dressings.
- Referral: if an endodontist is needed.
- Final restoration: a filling or a crown, depending on how much of the tooth remains.
Marsfield Dental Care provides a written, itemised quote after an assessment, which usually includes the root canal treatment and the crown. Private health benefits depend on your policy, limits and item numbers. Routine adult dental care is generally not covered by Medicare, although some public programs may cover it for eligible people. For more on fees and what is included, see our root canal therapy page.
Extraction may cost less at first, but replacing the tooth with a bridge, denture, or implant adds further cost. Neither option is always cheaper over time.
Deciding on treatment
Root canal treatment can help keep a damaged or infected tooth, but it depends on the tooth’s condition, a careful diagnosis and a good final restoration. Getting persistent pain checked early gives you the widest choice of options.
Concerned About Tooth Pain or Infection?
Ongoing tooth pain, lingering sensitivity or discomfort when biting? A dental examination at our Marsfield practice can help identify the cause and the treatment options that may suit you. Arrange a consultation to discuss your symptoms, possible treatment pathways and costs.
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Frequently asked questions
Can I take antibiotics instead of having a root canal?
Antibiotics can’t replace root canal treatment. Infected pulp inside a tooth has little or no blood supply, so medicine taken by mouth can’t clear it. Antibiotics may be used alongside treatment when the infection is spreading or you feel unwell, but the source of the infection must still be removed by root canal treatment or extraction.
Will I need a crown after root canal treatment?
Often, but not always. Back teeth take heavy chewing forces and usually need a crown to protect them from cracking after treatment. Front teeth with limited damage can sometimes be restored with a filling instead. Your dentist decides based on how much healthy tooth remains and how the tooth is used when you bite.
Can a root canal-treated tooth get infected again?
Yes. Reinfection can happen if bacteria get back into the canals, for example, through new decay, a cracked or leaking restoration, or canals that were very hard to clean. Some teeth can be retreated, while others may need extraction. A well-sealed final restoration, good daily cleaning and regular check-ups lower the risk.
Can I drive or go back to work after a root canal?
Most people can drive and return to normal activities straight after treatment under a local anaesthetic, since it doesn’t affect alertness. Your mouth may stay numb for a few hours, so take care with hot drinks and avoid chewing until feeling returns. If you had any form of sedation, follow your dentist’s specific advice about driving.
What happens if I don’t treat an infected tooth?
An infected tooth doesn’t heal by itself. Pain may come and go, but the infection can spread to the bone and surrounding tissues, form an abscess, and, in some cases, spread further. The tooth may become irreparable over time. Facial swelling, fever, or difficulty breathing or swallowing need urgent care.
Is a root canal or an extraction better for me?
It depends on whether the tooth can be restored predictably, how much structure and bone support remain, your general health and your preferences. Keeping a natural tooth is often worth considering, but not always. Your dentist should explain the benefits, risks, and costs of both, including what replacing an extracted tooth entails.
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