Root Canal Treatment

Root canal treatment (RCT) is a procedure that removes infected or inflamed pulp tissue from inside a tooth — the soft tissue containing nerves and blood vessels. It is needed when bacteria reach the pulp due to deep decay, a cracked tooth, trauma, or a failed filling. Without treatment, the infection spreads to the surrounding bone, causes an abscess, and the tooth is lost. Root canal treatment saves the tooth, eliminates pain, and prevents the infection from spreading.

Modern root canal treatment performed under effective local anaesthesia is not painful during the procedure. Patients are often surprised — the treatment relieves the pain caused by the infection, rather than causing it. Some sensitivity and mild aching for 2–3 days after each session is normal as the area heals. This is managed comfortably with over-the-counter pain relief. The reputation for pain comes from older techniques and inadequate anaesthesia, not current practice.

Most root canals at HOA are completed in 1–3 sessions depending on the tooth, the number of canals, and the severity of infection. Single-rooted front teeth often complete in one session. Multi-rooted molars (which have 3–4 canals) and teeth with active infections typically require 2–3 appointments spaced 1–2 weeks apart. Rotary instruments and electronic apex locators allow us to work efficiently and precisely, minimising the number of visits required.

Delaying treatment allows the infection to progress from the pulp into the surrounding bone, potentially forming a dental abscess. Symptoms can include severe spontaneous pain, swelling, facial cellulitis, and fever. More critically, continued infection destroys the bone around the root, ultimately making the tooth unrestorable — meaning extraction becomes the only option. Addressing pulp infection promptly is always less complex, less expensive, and less uncomfortable than the consequences of delay.

Root-canal-treated teeth can rarely re-infect if bacteria re-enter the tooth through a failed crown margin, a cracked tooth, or if the original treatment left trace infected tissue due to complex canal anatomy. This is called a failed root canal or root canal retreatment case. Retreatment involves re-opening the tooth, removing old filling material, and thoroughly re-cleaning the canals. Where retreatment is not possible, endodontic surgery (apicectomy) may be an option.

For posterior teeth — premolars and molars that bear significant biting force — a crown after root canal treatment is strongly recommended. Root-canal-treated teeth lose their nerve supply and over time become more brittle, and the crown protects them from fracture. For anterior teeth with sufficient remaining tooth structure, a composite build-up may be sufficient. Your dentist will advise you at the end of treatment.

The only alternative to root canal treatment for an infected tooth is extraction. Extraction is always an option, but it results in a missing tooth which then creates its own problems — shifting of adjacent teeth, bone loss, and the need for an implant or bridge to replace the gap. Saving a natural tooth through root canal treatment is almost always preferable to extraction, both functionally and economically, when the tooth is restorable.

Common signs include: prolonged sensitivity to heat or cold (lasting more than a few seconds after stimulus removed), spontaneous toothache especially at night, a darkening tooth, swelling or a pimple on the gum near the tooth, pain when biting or tapping the tooth, or a dental X-ray showing infection at the root tip (periapical abscess). You may also need a root canal with no pain at all if X-rays reveal an asymptomatic chronic infection. Regular dental check-ups catch these cases early.