What Actually Happens During a Root Canal

Maybe it started as a twinge with cold drinks, then became an ache that lingered, or a throb that woke you at 2 a.m. Now your dentist has said the words "root canal," and whatever you have heard from friends is running through your head.

The short answer: a root canal is a procedure to remove inflamed or infected tissue from inside a tooth, clean and seal the space, and keep the tooth rather than pull it. It is done under local anesthesia, it usually takes one or two appointments, and for most people the goal and the result is less pain, not more.

Why a tooth needs a root canal in the first place

Inside every tooth is a soft core called the pulp. It holds nerves and blood vessels, and it runs down through narrow channels in the roots. When a deep cavity, a crack, repeated dental work, or an injury lets bacteria reach the pulp, it can become inflamed or infected.

Once that happens, the tissue usually cannot heal on its own. Left alone, infection can spread into the bone around the root and form an abscess, and the tooth may eventually be lost. A root canal removes the problem tissue while leaving the tooth itself in place.

Antibiotics are not a substitute. The American Dental Association's 2019 guideline recommends against antibiotics for most tooth-related pain and localized swelling in adults with a healthy immune system, and says dental treatment such as a root canal should come first. Antibiotics are recommended when infection is spreading through the body, with signs like fever or feeling generally unwell. People with weakened immune systems may be treated differently.

The procedure, step by step

Your dentist or endodontist (a root canal specialist) starts with an X-ray to see the shape of the roots and any infection in the surrounding bone.

Next comes numbing. Local anesthetic is used to numb the tooth and the area around it. If a tooth is very inflamed, it can be harder to numb, and research shows extra anesthetic is often needed. If you still feel something, say so; your dentist can stop and give more.

A small rubber sheet called a dental dam is then placed around the tooth. It keeps the tooth clean and dry, keeps saliva and bacteria out, and protects you from swallowing or breathing in the small instruments and rinsing solutions used during treatment.

The dentist makes a small opening in the top of the tooth and uses fine instruments to remove the pulp from the chamber and each canal. The canals are cleaned, shaped, and rinsed with disinfecting solutions. For most people this part feels like pressure and vibration, not pain.

The cleaned canals are then filled with a rubber-like material called gutta-percha and a sealer. A temporary filling closes the opening. Appointments often run about 60 to 90 minutes, and some teeth, especially back molars with several canals, can take longer.

Some root canals are finished in one appointment; others are split over two, with medication placed inside the tooth in between. A 2022 Cochrane review found that both approaches appear to heal equally well on X-rays taken a year later. People treated in a single visit were somewhat more likely to have some pain during the first week, though short-term discomfort was common with either approach.

Does a root canal hurt, and what is recovery like?

A systematic review in the Journal of Endodontics found that about 81% of patients had pain before treatment. That dropped to about 40% one day after and about 11% after a week, with pain intensity falling to minimal levels by then.

Expect the tooth and jaw to feel tender for a few days. Over-the-counter pain relievers are usually enough. Brush and floss as normal but gently, and avoid chewing or biting on that tooth until it has its final restoration, because a temporary filling is not built for heavy biting.

If you are anxious about dental work in general, tell us up front. Talking through each step, agreeing on a signal to pause, and discussing sedation options can make a real difference.

Why the crown or final filling matters

A root canal is not quite finished when the canals are sealed. The tooth needs a permanent restoration, which for back teeth is usually a crown. One study that followed about 200 root-canal-treated teeth for several years found that those without a crown were lost at about six times the rate of those that received one. Front teeth sometimes do fine with a filling alone; your dentist will advise you.

With a good restoration and ordinary care, the American Association of Endodontists reports success rates above 90%. That is high, not a guarantee. A small share of treated teeth need retreatment or further care later.

When to see your dentist

Call promptly if you have a toothache that lingers after hot or cold, pain that wakes you up, a tooth that hurts to bite on, a pimple-like bump on the gum, or a tooth that has darkened after an injury. After a root canal, call if you have visible swelling inside or outside your mouth, severe pain or pressure, pain lasting more than a few days, a rash, hives or itching after taking a medication, a bite that feels uneven, a temporary filling that falls out, or your original symptoms coming back. Swelling with fever, or swelling that affects breathing or swallowing, needs same-day care.

Talk it through with us

If you are in Riverside or anywhere in the Inland Empire and a tooth is bothering you, or you have been told you need a root canal and want to understand your options first, Hashimi Dental is here to listen. Dr. Hashimi will explain what he sees, answer your questions, and go at a pace that feels right to you. Call us or book online at hashimidental.com.

This article is for general information only and is not a substitute for an exam or personal advice from your dentist.

Sources: American Dental Association (MouthHealthy; 2019 Clinical Practice Guideline on Antibiotic Use), American Association of Endodontists, Cochrane Oral Health (Mergoni et al., 2022), Journal of Endodontics (Pak & White, 2011), Journal of Prosthetic Dentistry (Aquilino & Caplan, 2002).