Failed root canal — what next?

A root canal is supposed to be the end of a tooth's pain story. So when patients come back months or years later with the same tooth aching again, they feel cheated. Often they have been told the only option is extraction.

In most cases, that is not true.

Failed root canals are more common than the profession admits. The reasons are usually mechanical: a missed canal (some molars have four canals, not three), incomplete cleaning, leakage at the top of the tooth, or — by far the most common — no crown placed after the RCT, allowing the tooth to fracture or re-infect.

The signs your root canal has failed: a dull ache that comes back, tenderness when biting, a small pimple or boil on the gum near the tooth, swelling, or a bad taste. Sometimes there is no pain at all and the failure shows up only on an X-ray during a routine check.

What we do at Dental Brasstacks when a failed RCT walks in: first, a calm conversation. Then a digital X-ray and, in most cases, a CBCT scan to see the tooth in 3D. The CBCT shows missed canals, hidden fractures, and the size of any infection at the root tip — none of which a 2D X-ray reliably catches.

From there, you usually have three real options: re-treatment (re-doing the root canal more thoroughly under microscope), apicectomy (a small surgical procedure that cleans the root tip from below), or extraction with implant placement. Each has a place. Extraction is rarely the first answer.

Re-treatment success rates with microscope-guided endodontics are between 75 and 90 percent — high enough that it is almost always worth trying before giving up on the tooth. The procedure takes one to two sittings and feels much like the original RCT.

If re-treatment is not possible — usually because the tooth itself is fractured — we plan the extraction and implant in the same conversation, so you never leave with an unanswered 'what now?'.

One more important thing: if your original RCT did not have a crown placed afterwards, that is the single biggest reason it failed. A root-canal-treated tooth without a crown is a fracture waiting to happen. We will always recommend the crown — and explain honestly why.

If you have an old root canal that is acting up, do not wait for the pain to become unbearable. The sooner we see it, the more options you have. Bring your old X-rays if you have them; we will give you a written second opinion.

Dental Brasstacks · Endodontic re-treatment & specialist-led RCT · Vipul World, Sector 48, Sohna Road, Gurugram · WhatsApp 9871256897.