What actually happens during a root canal

Ask people to name the worst thing a dentist can say and most will pick root canal. The reputation comes from an era before rotary instruments, effective anaesthetic technique and magnification. It has not caught up with the treatment.

Here is what genuinely happens, in order.

Why it becomes necessary

Inside every tooth is a chamber containing nerve and blood vessels. When decay, a crack or repeated trauma lets bacteria reach that chamber, the tissue inside becomes irreversibly inflamed and then dies. The infection spreads down the root and out into the bone at the tip, which is what produces an abscess.

At that point there are exactly two options: clean and seal the inside of the tooth, or remove the tooth. Antibiotics alone never resolve it — they can settle a swelling, but they cannot reach the dead tissue inside a tooth that no longer has a blood supply.

The appointment, step by step

1. 1.Anaesthetic. The tooth and surrounding area are fully numbed. We test it before starting and top it up if there is any doubt. You should feel pressure and vibration, never pain.
2. 2.Isolation. A thin rubber sheet is placed over the tooth. It keeps saliva and bacteria out of the canal and stops anything reaching the back of your throat. Most patients find this is the part that makes the appointment tolerable.
3. 3.Access. A small opening is made through the top of the tooth to reach the chamber inside.
4. 4.Cleaning and shaping. Fine flexible instruments remove the infected tissue from each canal, while disinfectant solution flushes the system. An electronic apex locator measures the exact root length so we clean to the tip and no further.
5. 5.Sealing. The canals are dried and filled with a rubber-based material that seals them against re-infection.
6. 6.Restoration. The access opening is sealed. For a back tooth this is usually a temporary filling, with a crown fitted at a later appointment.

Does it hurt?

The treatment itself should not. You are fully anaesthetised, and most patients are surprised by how ordinary the appointment turns out to be — the common feedback is that the hardest part was keeping the mouth open for ninety minutes.

The pain people associate with root canals is almost always the infection that brought them in. That usually improves markedly within a day or two of the first appointment.

Afterwards, expect the tooth to feel tender when you bite for three to five days. Ordinary pain relief handles it.

Why a crown usually follows

A root-treated tooth has lost internal structure and its blood supply, which leaves it more brittle than a living tooth. On a back tooth, which takes the full force of chewing, that combination leads to fracture surprisingly often — and a tooth that splits below the gumline cannot be saved.

A crown holds the remaining structure together. It is not an upsell; it is what makes the root canal worth having done. We will always quote for both together so the real cost is clear from the outset.