Your dentist has told you that you need a root canal. Before you go ahead, you want to know the truth. What is the actual failure rate? And what happens if it fails?

The honest answer is that root canals have a success rate of around 85-95%. That means they work most of the time. But "most of the time" is not "every time" — and understanding why matters for your decision.

A root canal treats the inside of your tooth. Your dentist removes the infected pulp, cleans the canals, and seals them. But if bacteria remain or re-enter, infection can return. Cracks in the tooth, complex canal anatomy, or delayed crowns can also lead to failure.

Sometimes a tooth that has had a root canal can still cause problems years later. The tooth may look fine on an X-ray but still harbour hidden infection.

If a root canal fails, you have a few options. Your dentist might recommend redoing the root canal (retreatment). They might suggest apical surgery (apicoectomy) to remove the tip of the root. Or they might recommend extraction and a dental implant or bridge.

The right choice depends on the condition of the tooth, your overall oral health, and your personal preferences.

If your dentist recommends a root canal, it is usually because the alternative is extraction. Saving your natural tooth is almost always preferable. Root canals are routine procedures with high success rates.

Talk to your dentist about your specific case. Ask about the longevity of the tooth, the risks, and what happens if you choose not to have the treatment. An informed patient makes the best decisions.