Persistent tooth pain, sensitivity to hot or cold, and swollen gums are the main warning signs. If you are experiencing any of these, a dentist needs to look at it today, not next month.
- A root canal treats infected or inflamed pulp tissue inside a tooth. It is not a punishment; it is what saves the tooth.
- The five main warning signs are: persistent pain, lingering sensitivity to heat or cold, tooth darkening, swelling or a gum bump near the tooth, and pain when biting.
- The procedure is done under local anaesthesia. Most patients find it no more uncomfortable than a standard filling.
- Most root canals are completed in one to two appointments. A crown is usually placed afterward to protect the tooth.
- Leaving an infected tooth untreated is not a safe alternative. The infection spreads and the consequences worsen over time.
- If you are in pain right now, Avira’s emergency dental team is available six days a week, including Thursday evenings.
Root canal. Two words that still make most people anxious, even though the procedure has changed enormously over the past two decades. The fear comes from reputation, not reality. A root canal done with modern technique and proper anaesthesia is, for most patients, far more comfortable than the toothache that preceded it.
The more pressing question is usually not “what does it feel like” but “do I actually need one?” This guide walks through the five symptoms that indicate you might, what happens step by step during treatment, how long it takes, what recovery looks like, and what the realistic cost is in Australia. It also addresses the question that should make everyone sit up: what happens if you do not treat it.
What is a root canal, and why would I need one?
Inside every tooth, beneath the hard white enamel and the layer of dentine below it, is a soft tissue called the pulp. The pulp contains nerves, blood vessels, and connective tissue. It plays an important role during the tooth’s development, but once the tooth is fully formed, it can survive without it.
When bacteria reach the pulp through deep decay, a crack, or a damaged filling, the pulp becomes infected or inflamed. Left without treatment, the infection spreads through the root canals into the surrounding bone. Root canal treatment cleans out the infected or inflamed pulp, disinfects the canals, and seals the tooth to prevent reinfection. The tooth is saved. The infection is cleared. The pain resolves.
That is the procedure. Not a dramatic extraction. Not anything that removes the tooth. Root canal treatment is specifically what allows you to keep the tooth rather than lose it.
Five warning signs you might need a root canal
No symptom alone confirms you need root canal treatment. Only a clinical examination and X-ray can do that. But these five symptoms are the clearest indicators that something serious is happening inside the tooth, and that waiting is the wrong decision.
Persistent tooth pain that does not go away
If a tooth hurts consistently, day and night, and the pain is not linked to obvious trauma or a recent filling, that is a significant warning sign. Pain that radiates into the jaw, ear, or surrounding teeth is particularly concerning. Unlike sensitivity from a cracked tooth or exposed root, infected pulp produces pain that has a relentless quality. It does not respond consistently to over-the-counter pain relief, and it does not resolve on its own.
Sensitivity to heat or cold that lingers
Many teeth are mildly sensitive to hot or cold. That is normal. The sign that points toward root canal is sensitivity that lingers for 10 seconds or more after the hot or cold stimulus is removed. If drinking hot coffee produces a pain that stays with you for 30 seconds or longer, the pulp inside that tooth is likely inflamed or dying. This type of prolonged thermal sensitivity is one of the most reliable clinical indicators of pulp involvement.
Tooth darkening or discolouration
A tooth that is becoming darker in colour, particularly one that has shifted to a grey or brown shade compared to the surrounding teeth, can indicate that the pulp inside has died or is dying. Dead pulp releases breakdown products that stain the dentine from within. This discolouration is not always accompanied by pain, which makes it easy to dismiss. However, a dead or dying pulp means the tooth is already infected at the root level, even if the nerve is no longer sending pain signals.
Swelling, tenderness, or a pimple-like bump on the gum
A raised, pimple-like bump on the gum near the base of a tooth is called a dental sinus or fistula. It is a channel the body has created to drain pus from an abscess at the root of the tooth. The bump itself may be painless, but what it indicates is far from minor: an active infection in the bone at the root tip. Facial swelling or swelling that extends to the jaw or neck requires emergency attention, as dental infections can spread rapidly and become life-threatening.
Pain or pressure when biting or chewing
Discomfort when biting down on food, even soft food, can indicate inflammation in the tissues surrounding the root tip, called the periapical area. This happens when infection has begun to spread beyond the pulp into the surrounding bone. The tooth itself may feel “higher” than normal in the bite, or there may be a sense of pressure or fullness in that area of the jaw. This symptom combined with any of the others above should prompt an urgent dental appointment.
Do not wait for your next routine appointment. Tooth infections progress faster than most people realise, and what starts as manageable pain can escalate to a dental abscess within days. Avira Dental’s emergency dental team is available Monday through Saturday, including extended evening hours on Thursdays. Call us on 02 4508 4604 or book online.
What actually happens during a root canal, step by step
The procedure is far more straightforward than its reputation suggests. Here is a plain-English walkthrough of what happens at each stage.
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Assessment and imaging
Before treatment begins, your dentist takes X-rays (and in complex cases, a 3D CBCT scan) to assess the extent of infection, map the canal anatomy, and confirm the diagnosis. This is also when the treatment plan and cost are discussed with you. Nothing proceeds until you understand exactly what is involved.
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Local anaesthesia
The tooth and surrounding area are fully numbed with local anaesthetic. Your dentist will ensure the area is completely numb before proceeding. You should feel pressure during the procedure but not pain. If you feel anything sharp at any point, you raise your hand and the dentist pauses and addresses it immediately.
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Access and pulp removal
A small opening is made through the top of the tooth to access the pulp chamber. Using fine instruments, the dentist removes the infected or inflamed pulp tissue from the chamber and each root canal. This is the central part of the procedure. It sounds alarming written out but feels like nothing more than gentle pressure under anaesthesia.
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Canal shaping and disinfection
The canals are carefully shaped using very fine files and thoroughly irrigated with an antibacterial solution to eliminate bacteria. The goal is to leave the canals clean, smooth, and free of infection so the subsequent seal is reliable. The number of canals varies by tooth: front teeth have one, molars can have three or four.
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Sealing the canals
The cleaned, shaped canals are filled with a rubber-like material called gutta-percha, which seals the space and prevents bacteria from re-entering. A temporary or permanent filling is placed in the access opening to close the top of the tooth.
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Crown placement (usually at a second appointment)
A tooth that has had root canal treatment is more brittle than a living tooth because it no longer has a blood supply inside. For this reason, most root canal-treated teeth, particularly back teeth that bear significant chewing force, are protected with a dental crown afterward. This is usually scheduled as a separate appointment once the tooth has settled.
How long does a root canal take in Australia?
The time required depends on which tooth is being treated and the complexity of the canal anatomy. Front teeth have a single canal and a relatively straightforward shape. Upper molars typically have three canals; lower molars often have two to four. A more complex molar with curved or calcified canals will take longer than a front tooth with a single straight canal.
Most straightforward root canals are completed in a single appointment of 60 to 90 minutes. More complex cases, or cases where a significant infection needs time to settle, may require two appointments. The crown that follows is a separate appointment, typically one to two weeks later.
Is a root canal painful?
This is the question almost everyone asks, and the honest answer is: not during the procedure.
Root canal treatment is performed under local anaesthesia. The goal before beginning any instrumentation is a completely numb tooth and numb surrounding tissue. Most patients report that the experience is comparable to having a filling placed, and many are genuinely surprised by how unremarkable it feels given the anxiety they had walking in.
The pain people associate with root canal treatment is largely the pain that existed before the procedure, from the infected or inflamed pulp. Removing that tissue removes the source of the pain. Most patients feel significantly better within a day or two of treatment, though mild tenderness in the area for three to five days afterward is normal as the tissue around the root tip heals.
For patients who experience significant dental anxiety, sedation dentistry is available at Avira Dental. IV sedation in particular allows the entire procedure to be completed while you are in a deeply relaxed, dream-like state with little to no memory of the appointment afterward. This changes the experience entirely for patients who would otherwise avoid treatment because of fear.
Recovery and aftercare
Recovery from root canal treatment is generally mild and manageable. The tooth will feel tender when biting for a few days, and the surrounding gum tissue may be mildly sore. This typically peaks at 24 to 48 hours and resolves within a week for most patients.
What to expect and do during recovery
- Take over-the-counter anti-inflammatories such as ibuprofen for the first one to two days if needed. Your dentist may prescribe antibiotics if there was an active infection at the time of treatment.
- Avoid chewing on the treated tooth, particularly hard or crunchy foods, until the permanent crown is in place. The tooth is more vulnerable to fracture during this interim period.
- Brush and floss normally around the tooth, being gentle near the treated area for the first few days.
- Contact your dentist if you experience swelling that is worsening rather than improving, severe pain not responding to pain relief, or if the temporary filling feels like it has come out entirely.
- Attend your crown appointment as scheduled. Leaving the tooth uncrowned for an extended period increases the risk of fracture.
Why a crown usually follows a root canal
A tooth that has had root canal treatment has lost its blood supply. Over time this makes the tooth more brittle and more susceptible to cracking under the forces of normal chewing. For front teeth that bear less bite force, a crown may not always be necessary. For back teeth including premolars and molars that handle significant chewing load, a crown is strongly recommended and in most cases considered part of the complete treatment.
The crown restores the tooth to full function, protects it from fracture, and seals the access opening made during the root canal. A tooth that fractures below the gumline after a root canal treatment, because it was left uncrowned, generally cannot be saved and must be extracted. The crown is what protects the investment made in the root canal.
Cost of root canal treatment in Australia
| Treatment | Typical range | Notes |
|---|---|---|
| Root canal: front tooth (1 canal) | $1,000 to $1,800 | Single canal; simpler anatomy; fewer appointments |
| Root canal: premolar (1 to 2 canals) | $1,200 to $2,200 | Moderate complexity; often one appointment |
| Root canal: molar (3 to 4 canals) | $1,500 to $3,000 | Most complex; curved or calcified canals increase cost |
| Crown (recommended after RCT) | $1,500 to $2,500 | Material and tooth location affect cost |
| Total (root canal plus crown) | $2,500 to $5,500 | The complete treatment to restore and protect the tooth |
Private health insurance with major dental extras may contribute a benefit toward root canal treatment and/or the crown, subject to annual limits and waiting periods. Check with your fund specifically: many people discover they have more cover than they realised once they ask the right question.
Avira Dental provides a full written cost breakdown at your consultation before any work begins, and flexible payment plans are available. Download our pricing guide or book a free consultation for a case-specific quote.
What happens if you leave it untreated?
This section matters, because “wait and see” is not a safe option when a tooth needs root canal treatment.
The pulp infection does not resolve on its own. There is no immune response that clears a tooth infection without intervention. What can happen is that the nerve inside the tooth dies, which may temporarily reduce the pain signal, and patients sometimes interpret this as the problem having resolved. It has not. The infection continues to spread into the bone surrounding the root, forming a dental abscess.
From there, the consequences escalate. An untreated dental abscess can spread to surrounding teeth, into the jaw, and into the soft tissue of the neck. In serious cases, dental infections spread to the airway or become systemic. These are genuine medical emergencies that require hospitalisation.
Even in the less severe trajectory, ignoring an infected tooth means eventual extraction. The tooth that could have been saved with a root canal becomes unrestorable. That then opens a separate and more expensive set of decisions about tooth replacement with an implant, bridge, or denture.
The cost and complexity of the problem only increase with time. Treating it now is almost always the simpler, less expensive, and less painful path.
If you have facial swelling, difficulty swallowing, difficulty opening your mouth, or swelling extending toward your neck, this is a medical emergency. Present to your nearest emergency department immediately. For severe tooth pain without these symptoms, Avira’s emergency dental team sees urgent cases the same day wherever possible.
When to book urgently vs when to monitor
Not every dental concern requires immediate action. Here is a clear guide to what warrants urgent attention and what can be monitored with a scheduled appointment.
Book urgently, today
- Persistent tooth pain lasting more than a day or two
- Sensitivity to heat that lingers for 10 seconds or more
- Visible swelling in the gum, jaw, or face
- A pimple-like bump on the gum near a tooth
- Pain severe enough to keep you awake at night
- Any facial swelling that is spreading or affecting swallowing
- Tooth pain combined with fever
Schedule a routine assessment
- Mild sensitivity to cold that passes within a second or two
- Minor sensitivity on a recently filled tooth that is gradually settling
- Awareness of a tooth but no consistent pain
- Tooth feels slightly different when biting but no ongoing pain
- Overdue for a check-up and want a professional review before concerns escalate
When in doubt, book the appointment. A dental assessment to find out nothing is seriously wrong costs far less than delayed treatment of something that has progressed. Regular dental examinations at Avira Dental are also the most reliable way to catch problems before they become root canal territory in the first place.
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Frequently asked questions
Worried about a tooth? Do not wait.
Tooth infections move faster than most people expect. Book a same-day emergency assessment or a free consultation at Avira Dental. We will tell you exactly what is happening, what your options are, and what it will cost, before anything is done.
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General information only. This article is intended as an educational guide and does not constitute clinical advice. Symptoms described may have causes other than pulp infection and should be assessed by a qualified dental professional before any diagnosis or treatment decision is made. Cost ranges cited are indicative 2026 market figures and vary by clinical complexity, tooth type, and provider. A formal written treatment plan and cost will be provided following your clinical consultation at Avira Dental. Avira Dental is a registered dental practice in Penrith, NSW. Registered Dentist General Registration: DEN0002141469.