What Happens Inside an Infected Pulp (Necrosis & Abscess)
The pulp is the soft tissue inside a tooth, holding its nerve and blood supply, and root canal treatment becomes necessary when that tissue becomes inflamed or infected beyond the point of healing on its own. Bacteria reach the pulp through deep decay, a crack, or repeated dental work on the same tooth, and because the pulp sits inside a hard-walled chamber that cannot expand, the resulting inflammation has nowhere to go and becomes painful rather than settling by itself.
Left untreated, an infected pulp progresses to pulp necrosis, where the tissue dies, and the infection can then spread past the root tip into the surrounding bone, forming a dental abscess. This is the reason a tooth that stops hurting has not necessarily healed. A tooth can go quiet because the nerve has died rather than because the infection has resolved, and the infection itself can keep progressing in the bone while the tooth feels fine. Facial swelling, fever, or difficulty swallowing or breathing alongside a toothache are same-day problems that need urgent attention; a hospital emergency department is the right place for rapidly spreading swelling or breathing difficulty specifically, not for an uncomplicated toothache.
The clinical distinction a dentist draws is between reversible and irreversible pulpitis. Reversible pulpitis is a short, sharp response to a trigger like cold water that settles once the trigger is gone, and it can sometimes be managed conservatively without a root canal. Irreversible pulpitis produces pain that lingers after the trigger is removed, or pain that starts without any trigger at all, and once the pulp has reached that point it does not recover on its own; root canal treatment or extraction are the two remaining options, with a dental implant one way an extracted tooth can later be replaced if that path is chosen. Painkillers can mask the discomfort of an infected pulp, but they do not treat the underlying infection, and continuing to delay treatment on that basis risks the infection progressing to an abscess while the pain is temporarily controlled.
Only a dentist can make this assessment reliably, using a combination of the patient's description of the pain, a cold test, and imaging where needed. Two teeth can present with very similar pain and have different underlying diagnoses, which is why a description of symptoms alone, without an examination, is not enough to confirm what treatment a specific tooth needs.
Step-by-Step Procedure: Cleaning, Shaping, Gutta-Percha Sealing
Root canal treatment removes the infected or dead pulp tissue, cleans and shapes the space inside the root, then fills and seals it so the infection cannot return. The dentist accesses the pulp chamber through the top of the tooth, removes the diseased tissue from each canal, and shapes the canals so they can be cleaned and later sealed completely. Once the canals are clean and shaped, they are filled with gutta-percha, a biocompatible rubber-like material, and sealed to stop bacteria re-entering, and the access opening is then closed.
The whole procedure is carried out under local anaesthetic, so the treatment itself is not what causes root canal pain; the pain a patient feels before treatment comes from the infection, and anaesthetic manages the discomfort of the procedure that removes it. Whether treatment is completed in one visit or split across two depends on the individual case: a straightforward infection is often finished in a single appointment, while a tooth with a more persistent or recurrent infection may need two sessions so the canals can be medicated and reassessed before the final seal. The treating dentist makes that call from what is found once the canal is opened, not from a rule that applies to every tooth.
Some tenderness in the days after treatment is expected and normally settles. Pain that keeps getting worse rather than easing, new swelling, or a returning abscess is different and needs review, since it can mean the infection has not fully cleared and the tooth may need retreatment. There is no fixed day or week by which lingering pain becomes a concern in the published evidence this site can cite, so treat a worsening pattern, not a specific number of days, as the signal to call the clinic.
Imaging is part of both ends of the procedure: an X-ray before treatment helps the dentist map how many canals a tooth has and confirm the extent of the infection, and a further image is typically taken to check the fill has reached the full length of each canal before the tooth is sealed. As with the healing interval, the number of canals and the exact shape of the root system vary from tooth to tooth and cannot be stated in advance without imaging that specific tooth.
Why a Dental Crown Is Usually Needed After Endodontics
A crown is usually recommended after root canal treatment on a back tooth, or on any tooth that already had a large filling or significant decay before treatment, because removing the pulp and the access needed to treat it leaves less of the tooth's own structure intact. A crown caps and protects that weakened structure from fracturing under everyday biting force. A smaller front tooth with a conservative access opening may sometimes be restored with a filling instead of a full crown, and that decision is made tooth by tooth after treatment is complete, based on how much natural structure remains.
There is no published figure for how long a crown lasts on a root-treated tooth specifically, so this page does not quote one; longevity depends on fit, hygiene and bite, the same factors that apply to any crown. What is consistent is the sequence: root canal treatment first, then an assessment of whether the remaining tooth structure needs a crown's protection or can be restored more conservatively.
As with any dental procedure, root canal treatment carries risks the dentist will explain beforehand: these can include a canal that is more complex than expected, a fine instrument fracturing inside the canal during cleaning, or the tooth not fully settling and needing retreatment or, in a minority of cases, referral for surgery or extraction. None of these is the expected outcome, and they are disclosed as known possibilities rather than a likely result for a specific tooth.
Cost Factors, Public Dental and Health Fund Cover
There is no official schedule of private dental fees in Australia, so no single root canal price applies statewide; every practice quotes its own fee after an examination, and the Australian Dental Association's Schedule of Dental Services sets the item numbers a quote is built from rather than a price. Root canal treatment is itemised per canal under items 415 (chemo-mechanical preparation) and 417 (obturation, the filling and sealing step), so a molar with three canals is quoted differently to a single-canal front tooth, and a crown afterwards is a separate item again.
| Who pays | What applies | Source |
|---|---|---|
| Children 0 to 17 | Bulk billed through the Child Dental Benefits Schedule; no fee to the family even if the CDBS cap is used up, since Oral Health Services Tasmania's own public dental service covers the gap | Services Australia; Tasmanian Department of Health |
| Concession-card adults | Oral Health Services Tasmania co-payment, $47 per appointment, capped at $188 for a course of general care; complex cases may attract an additional co-payment | Tasmanian Department of Health |
| Everyone else | A private fee set by the practice, itemised under ADA items 415, 417 and any crown item; a health fund's major dental benefit may cover part, subject to the policy's waiting period and annual limit | The clinic's own quote; the health fund's Private Health Information Statement |
Ask for a written, itemised quote before treatment starts, listing item 415 and 417 per canal along with any crown item, so the total is transparent and can be checked against a health fund's benefit schedule line by line. A quote broken down this way is also what makes it possible to compare two clinics fairly, since a single headline figure can hide what is and is not included.
Whether root canal treatment or extraction works out cheaper depends on what replaces the tooth if it is extracted, not just the first bill. A root canal plus a crown is one episode of treatment; an extraction is often followed by a replacement, such as an implant, bridge or denture, which is its own separate cost. Comparing only the first invoice from each path hides that second cost, so ask for an itemised quote for the full course either way, not just the first appointment, before deciding. For the full comparison, including what happens to the jawbone after an extraction and a structured decision matrix, see root canal vs tooth extraction.
A tooth kept in place with root canal treatment also keeps its periodontal ligament, the tissue that attaches the root to the surrounding bone, and the bone that ligament supports. Extraction is generally the right answer only once a tooth is assessed as non-restorable, such as a root fracture extending below where the gum attaches, decay reaching below that same point, or advanced bone loss around the tooth. Whether a specific tooth has reached that point is a finding from an examination and radiographs, not something to assume from pain alone.