Is a Root Canal Really That Painful?

By Lovik Mirzaeian, DDS. Updated September 2026.

A root canal is not painful. The tooth is completely numb throughout, and patients who have actually had one typically describe it as no worse than a filling. The pain people associate with root canals is the infection that made the treatment necessary, and the procedure is what ends it.

The reputation is decades out of date, and it keeps people in genuine pain from getting treated. Here is what actually happens.

Where the Reputation Came From

Two things. First, root canals used to be genuinely rough. Anaesthetics were less reliable, instruments were manual, and appointments were long. That has not been the case for a long time.

Second, and this is the bigger one, root canals are done on teeth that are already causing severe pain. Someone arrives with an abscess and days of throbbing, has the treatment, and remembers the whole episode as painful. The treatment gets the blame for the pain it removed.

What Actually Happens

The tooth and the surrounding area are numbed. This is the same anaesthetic as a filling, and if you are not fully numb, more is given. Nobody should feel a root canal.

A small opening is made in the top of the tooth. The dead or infected pulp is removed from the canals inside the roots. The canals are cleaned, shaped and disinfected, then filled with a rubber-like material and sealed.

A back tooth is then usually crowned, because a root treated tooth has been hollowed out and lost its blood supply, which makes it more brittle. Our piece on whether you really need a crown explains why that step matters.

Start to finish, one to two hours. What most people report as the difficult part is holding their mouth open, not sensation.

What It Feels Like Afterwards

The tooth is usually tender to bite on for a few days while the ligament around the root settles. Ordinary over the counter painkillers handle it. Most people are back to normal in two or three days, and the deep throbbing they arrived with is gone immediately.

Severe pain, swelling, or pain that is getting worse after several days is not normal and is worth calling about, though it is uncommon.

If You Are Anxious About It

Dental anxiety is real and it is common, and there is no need to grit your teeth through it. Sedation ranges from mild relaxation to sleeping through the appointment entirely. Patients who have avoided treatment for years often get everything done in a single sedated visit and are genuinely surprised afterwards.

Telling us you are nervous changes how the appointment runs. It is not something to be embarrassed about, and most of our sedation patients are people who put something off for far too long.

The Real Question Is What Happens If You Do Not

An infected pulp does not recover. The infection spreads through the root tip into the bone and forms an abscess, and untreated abscesses can become serious rather than merely painful. Our article on dental abscesses covers the warning signs.

The alternative to a root canal is losing the tooth. That means an extraction, then either living with a gap while the neighbouring teeth drift and the bone shrinks, or replacing it with a dental implant or a bridge. All of those cost more than the root canal and none of them work as well as your own tooth. The American Dental Association makes the same point.

How to Tell a Tooth Needs One

The classic signs are a lingering ache after something hot or cold, pain that keeps you awake, a tooth that hurts to bite on, a gum that has a small bump beside the tooth, or a tooth that has darkened compared to its neighbours.

One pattern catches people out. Sometimes a tooth hurts badly for days and then stops completely. That often means the nerve has died rather than recovered, and the infection carries on silently in the bone. Relief is not always good news, and a tooth that hurt severely and then went quiet is still worth having looked at.

Some teeth need treatment with no symptoms at all, found as a dark shadow at the root tip on a routine x-ray. That is one of the reasons images get taken when nothing hurts.

How Long a Treated Tooth Lasts

Properly done and properly restored, a root treated tooth can last the rest of your life. Success rates are high, in the region of nine in ten. The failures are usually teeth that were never crowned and fractured later, or teeth where decay got back in under an old restoration years afterwards. Both are avoidable, and both come down to finishing the job and then keeping up with exams.

Frequently Asked Questions

Is a root canal really that painful?

No. The reputation comes from the era before modern anaesthetics, and from the fact that people arrive in severe pain from the infection itself. Surveys of patients who have actually had one consistently find they rate it about the same as having a filling. The pain you walk in with is the painful part.

Why does a root canal have such a bad reputation?

Partly history and partly association. Root canals are done on teeth that are already in agony, so the memory of the pain gets attached to the treatment that ended it. The phrase has also become shorthand for anything unpleasant, which keeps the idea alive regardless of what the procedure is actually like.

How long does a root canal take?

One to two hours, usually in a single visit for a front tooth and sometimes two visits for a molar with several canals. You are numb throughout. Most people find the hardest part is keeping their mouth open, not anything they feel.

Is it better to just pull the tooth?

Almost never, if the tooth is restorable. Nothing performs as well as your own tooth. Extraction is cheaper on the day, then costs more overall once you replace it, and if you do not replace it the neighbouring teeth drift and the bone shrinks. Keeping the tooth is the better long term outcome.

Been Told You Need a Root Canal? Come and Talk It Through

If the word alone is what is stopping you, that is worth a conversation before anything else. We will show you the x-ray, explain what we are seeing, and go through the sedation options. Contact us to set up a consultation, no commitment to treatment on the day.

Lovik Mirzaeian, DDS has achieved extensive training in multidisciplinary dental treatments. His credentials include Dental Implants, Cosmetic Dentistry, Full Mouth Reconstruction, Endodontics, Oral Surgery, Orthodontics, and Sleep Sedation. Our office puts your comfort and smile first, and we are dedicated to giving you top-notch dental care. Get ready to show off your perfect smile!

Looking for a trusted family dentist in Clovis? Dr. Mirzaeian welcomes new patients of all ages.