Root canal or extraction: how the choice is made

Why keeping your own tooth comes first

Every tooth shares the work of chewing with its neighbours and keeps the bone underneath it busy. A natural root is anchored in the jaw in a way no artificial replacement copies exactly. So the working rule in dentistry is a plain one: a tooth that can be kept is kept. That is what root canal treatment is for. The inflamed tissue inside the tooth is cleaned out, the canals are filled, and the hard shell of the tooth stays where it is. Pain on its own settles nothing; a tooth that aches badly can often be saved, and a tooth that never hurt at all may have to come out.

Four things that settle the question

A dentist choosing between treatment and removal never looks at the tooth alone. What is left of the crown, whether the root is intact, how firmly the gum and bone still hold the tooth, and what job that tooth does in the mouth are weighed together. When all four look healthy the decision is easy. When one of them has broken down badly, the tooth often cannot stay for long even if the other three are sound.

• Remaining tooth structure: how much solid wall is left above the gum
• Root cracks: whether a split runs the length of the root
• Gum and bone support: how loose the tooth has become
• The tooth's role: how much chewing and speech depend on it

How much sound tooth is left

A root canal cleans the inside of a tooth; it does not rebuild the outside. Once treatment is finished a filling or a crown goes on top, and that rebuild needs solid walls to grip. If a band of firm tooth still runs right around above the gum line, the rebuild holds. If decay has run down under the gum, or the tooth has broken almost to root level, the piece placed on top can come loose within months even though the canals were filled well. In a tooth like that, the walls decide, not the canals.

A split root leaves little room

A crack running the length of a root is the one thing root canal treatment cannot repair. The line of the split keeps the inside of the root connected to the bacteria in the mouth, so however well the canals are filled, the inflammation returns. Such a crack does not always show on a radiograph; sometimes it is only found once the tooth is opened or the gum is lifted aside. Sharp pain at one particular spot when biting, a stubborn abscess around a single root, and swelling that will not settle all point that way.

A root canal that failed once does not mean the tooth is finished; in most cases the canals can be cleaned and filled again.

The gap afterwards is its own decision

Taking a tooth out ends one job and starts another. Neighbouring teeth drift into the empty space over time, the opposing tooth moves towards the gap, and the bite changes shape. That is why the plan for filling the gap belongs in the same conversation as the removal: an implant, a bridge or a partial denture. Which one suits depends on where the tooth sat, on the state of its neighbours and on how much bone lies underneath. Sometimes a few months of healing are needed between the removal and the replacement.

How the examination narrows it down

The answer rarely comes from one look. A radiograph shows the shape of the root, how many canals there are and how large the inflammation at the root tip has grown. The gum is judged by measuring the pockets around the tooth; a deep pocket at one narrow spot can be the signature of a split root. How much the tooth moves, and where it hurts when you bite, both feed into the picture. In some teeth the answer only becomes clear once the old filling is lifted and the dentist can see inside, so a plan may change partway through. Hearing that possibility beforehand saves an unwelcome surprise later.

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