Root canal or extraction? How the decision is actually made

When a tooth is badly infected you face a choice: treat the inside of it and keep it, or remove it and decide later how to replace it. Patients often expect a dentist to push the more expensive option. The real decision turns on specific, assessable factors.

The case for saving the tooth

A natural tooth has a periodontal ligament, a thin layer of fibres suspending it in the bone. That ligament gives proprioception, the sense of how hard you are biting, which no implant reproduces. It also lets the tooth flex slightly under load. Keeping your own tooth maintains the bone around it, avoids surgery, and costs less than an implant.

Modern root canal treatment on a tooth with sound roots and enough remaining structure has an excellent long-term outlook. It is not the ordeal of reputation; with proper anaesthesia it feels like having a filling done, and it relieves pain rather than causing it.

When a tooth genuinely cannot be saved

• A vertical root fracture. A crack running down the root is not repairable. This is the clearest indication for extraction.
• Not enough tooth left. If decay has taken the tooth below the gum and bone level, there is nothing to hold a crown. Crown lengthening can sometimes rescue this; often it cannot.
• Advanced bone loss. A tooth that is already loose from periodontal disease will still be loose after a perfect root canal.
• Failed re-treatment. Where a root filling has been redone and the infection persists, and apicectomy is not feasible.
• Unfavourable anatomy, such as severely curved or calcified canals that cannot be cleaned to the tip.

The half-measures to avoid

Two are common. The first is antibiotics alone. They will settle a swelling temporarily, but the source of the infection is the dead pulp inside the tooth, and antibiotics do not reach it. The infection returns, usually worse. The second is a root canal without a crown on a back tooth. Root-treated molars become brittle and fracture, often unrestorably, and a tooth lost that way has wasted both the treatment and the money.

If extraction is the answer

Decide the replacement plan before the tooth comes out, not afterwards. If an implant is likely, socket preservation grafting at the time of extraction keeps the bone volume and makes the implant straightforward months later. Left to heal on its own, the ridge can lose up to half its width in the first year, and the graft you avoided becomes a graft you now need.

Not every gap needs filling, incidentally. A missing last molar with a sound bite in front of it may need nothing at all. We will tell you when that applies.

More on root canal treatment, extractions and dental implants.