What Actually Happens During a Root Canal — And Why It’s Not What You’re Afraid Of

Root canals have a reputation that doesn’t match the reality. Dr. Liza Wakim walks through every step of the procedure — what you feel, how long it takes, and what recovery actually looks like.

Root canal therapy has a reputation that is spectacularly out of proportion with the actual experience.

Ask most people to name the dental procedure they’re most afraid of, and root canal comes up immediately — usually delivered with a grimace, as if the words alone are painful. The procedure has become cultural shorthand for something deeply unpleasant. “I’d rather have a root canal than…” is a phrase everyone understands.

And yet, patients who’ve had a root canal — once it’s done — almost universally say some version of the same thing: that was not what I expected.

What they expected was excruciating. What they experienced was manageable. Sometimes even anticlimactic.

The gap between the reputation and the reality comes almost entirely from a lack of information about what the procedure actually involves. So let me close that gap.

First — what a root canal is treating

This matters for understanding the experience, so bear with me for one moment of context.

A root canal treats an infected or inflamed pulp — the soft tissue inside the tooth that contains the nerve. When bacteria reach that tissue through decay, a crack, or a compromised restoration, the pulp becomes inflamed. That inflammation is what produces the severe toothache that often precedes a root canal diagnosis. The nerve is irritated and sending pain signals.

Here’s the important part: the root canal removes that tissue. Once the infected pulp is gone, the source of the severe pain is gone with it. Most patients feel significantly better after the procedure than they did before it, because the acute infection and nerve inflammation that was driving their pain has been addressed.

The procedure doesn’t cause pain. In most cases, it relieves it.

What happens at each stage

Total procedure time: 60–90 minutes for most teeth. Mild soreness for 2–3 days after is normal. Most patients feel better the day after treatment than they did before it.

Before the procedure: diagnosis and preparation

A root canal begins with a thorough examination — clinical assessment of the tooth and surrounding tissue, X-rays to evaluate the root structure and surrounding bone, and confirmation that root canal therapy is the appropriate treatment. If there’s an active abscess with significant swelling, antibiotics may be prescribed first to reduce the infection before the procedure, which also improves the effectiveness of the anesthesia.

Anesthesia

This is where most patients’ anxiety concentrates. The injection.

I want to be honest: the injection is often the most uncomfortable moment of the appointment. It’s brief — a matter of seconds to administer — and I apply topical anesthetic first to numb the surface before the needle, which reduces the sensation significantly. For patients with active infection, anesthesia can occasionally be more challenging to achieve fully — infected tissue is more acidic, which can reduce anesthetic effectiveness in rare cases. If this happens, I don’t proceed until the area is fully numb. You should not feel pain during this procedure. If you do, tell me.

Once the anesthesia has taken effect, you’ll feel pressure and movement throughout the procedure. You may feel vibration from the instruments. You may sense the dentist working. You should not feel sharp or shooting pain. Most patients describe the experience — once numb — as similar to having a filling: some pressure, some sound, some time in the chair, but not pain.

Isolation and access

Once you’re numb, I place a dental dam — a thin rubber sheet that isolates the tooth being treated from the rest of the mouth. This keeps the area dry and clean throughout the procedure and is standard practice for root canal therapy. It can feel slightly unusual at first but most patients stop noticing it quickly.

I then create an access opening through the crown of the tooth to reach the pulp chamber — the space inside the tooth where the pulp tissue sits above the root canals.

Removing the pulp and cleaning the canals

Using very fine instruments called files, I remove the pulp tissue from the pulp chamber and from each of the root canals — the narrow channels that extend from the chamber down through the roots. The canals are then shaped and cleaned using a combination of instruments and an antimicrobial irrigant that flushes out bacteria and debris.

This is the part of the procedure that takes the most time. A tooth can have anywhere from one to four or more root canals depending on which tooth it is and the individual anatomy — molars, which have multiple roots, take longer than front teeth. The total procedure time is typically 60 to 90 minutes for most teeth, though complex cases or teeth with unusual anatomy can take longer.

During this phase, you may feel pressure and sensation of movement. With adequate anesthesia, this should not be painful. The sound of the instruments can be startling if you’re not expecting it — fine files, irrigation syringes, suction. If the sound bothers you, this is a good time for headphones.

Filling and sealing the canals

Once the canals are cleaned and shaped, they’re filled with a biocompatible material called gutta-percha — a rubber-like substance that seals the canals and prevents bacteria from re-entering. The access opening is then sealed with a temporary or permanent filling material.

At this point, the procedure itself is complete.

The crown

A root canal treated tooth typically needs a crown placed in a follow-up appointment. The tooth has been structurally altered — the access opening, the removal of internal tissue — and is more susceptible to fracture under biting forces than an intact tooth. A crown protects it and restores full function. I cover the timing and process for crowns in detail separately.

How long does it take?

A straightforward root canal on a front tooth: 45 to 60 minutes. A molar with multiple canals or complex anatomy: 90 minutes or more. Some cases are completed in a single appointment; others are done in two appointments if the infection is significant and a second cleaning session helps ensure complete elimination of bacteria before sealing.

I give patients a realistic time estimate at the start of the appointment so they’re not watching the clock wondering how much longer.

What to expect afterward

This is the part the reputation gets most wrong. Patients brace for days of severe pain after a root canal, and what most of them experience is:

Mild to moderate soreness in the tooth and surrounding tissue for a few days. This is normal — the area has been worked on, and there’s some tissue inflammation around the root tip as the body begins healing. Over-the-counter ibuprofen handles this well for most patients.

Some tenderness when biting on the treated tooth for a few days, particularly if there was significant infection beforehand. This settles as the inflammation resolves.

No acute pain. The severe toothache that preceded the procedure — the one driven by inflamed, infected pulp — should be significantly reduced or gone. If pain is escalating after the first 48 hours rather than improving, or if swelling is developing, call the office.

Most patients are back to normal within two to three days. Many feel noticeably better the day after the procedure than they did the week before it.

The question I hear most afterward

“Why did I wait so long?”

The same thing I hear after implants. After crowns. After most of the procedures patients delay because of fear.

The fear is understandable — it comes from something real, which is that root canals used to be more painful and more technically difficult before modern anesthesia, modern instruments, and modern techniques changed the experience significantly. The reputation is inherited from a different era of dentistry.

What I do at Enhanced Wellness is not that. If you need a root canal and you’re afraid, come in and let’s talk through what the procedure would specifically look like for your tooth, your situation, and your comfort level. Knowing what to expect is most of what makes the experience manageable.

Ready to take the next step?

If you’ve been told you need a root canal and have been putting it off, or if you think you might need one and haven’t come in yet — I’m here in Washington, PA and happy to see patients from the greater Pittsburgh area as well. Let’s talk through what’s happening with your tooth and what we can do about it.