What Happens During a Root Canal? A Step-by-Step Guide

The words “root canal” often make people feel anxious, but modern root canal treatment is a routine dental procedure designed to relieve pain—not cause it. Thanks to advances in dental technology and effective local anaesthetic, most patients find the experience no more uncomfortable than having a routine filling.

If your dentist has recommended root canal treatment, understanding what happens during the procedure can help put your mind at ease. In this guide, we’ll explain why a root canal is needed, what to expect during treatment and how to care for your tooth afterwards.

What Is Root Canal Treatment?

Root canal treatment, also known as endodontic treatment, is a procedure used to save a tooth when the soft tissue inside it, known as the dental pulp, becomes infected or damaged.

The pulp contains nerves, blood vessels and connective tissue that help the tooth develop. Once a tooth has fully matured, it can continue to function without the pulp because it receives nourishment from the surrounding tissues.

If the pulp becomes infected, bacteria can spread inside the tooth, leading to pain, swelling and eventually an abscess if left untreated. Root canal treatment removes the infection while preserving the natural tooth.

Why Might You Need a Root Canal?

Your dentist may recommend root canal treatment if the pulp has become inflamed or infected due to:

• Deep tooth decay
• A cracked or fractured tooth
• Repeated dental procedures on the same tooth
• Trauma or injury to the tooth
• Severe wear or damage

Without treatment, the infection may spread to the surrounding tissues, causing increased discomfort and potentially leading to tooth loss.

Common Signs You May Need Root Canal Treatment

Not everyone experiences symptoms, but common signs include:

• Persistent toothache
• Pain when chewing or biting
• Sensitivity to hot or cold that lingers
• Swollen or tender gums
• A small pimple or swelling on the gum
• Tooth discolouration
• A loose tooth

If you notice any of these symptoms, it’s important to arrange a dental appointment as soon as possible.

What Happens During a Root Canal?

Many patients are surprised by how straightforward the procedure is. Root canal treatment is usually completed over one or two appointments, depending on the severity of the infection.

Step 1: Examination and Diagnosis

Your dentist will first examine the affected tooth and may take digital X-rays to assess the extent of the infection and determine whether root canal treatment is the most appropriate option.

They will also discuss the procedure with you and answer any questions before treatment begins.

Step 2: Local Anaesthetic

Before treatment starts, your dentist will numb the area using a local anaesthetic. This ensures you remain comfortable throughout the procedure.

If the tooth has already lost its nerve due to infection, there may be very little sensation, but local anaesthetic is still used to maximise comfort.

Step 3: Isolating the Tooth

A small protective sheet, known as a dental dam, is placed around the tooth. This keeps the area clean, dry and free from saliva while preventing bacteria from entering the tooth during treatment.

Step 4: Accessing the Root Canal

Your dentist will make a small opening in the top of the tooth to gain access to the infected pulp chamber and root canals.

Specialised dental instruments are then used to carefully remove the infected or damaged pulp tissue.

Step 5: Cleaning and Shaping the Canals

Once the infected tissue has been removed, the inside of the tooth is thoroughly cleaned and disinfected to eliminate bacteria.

The root canals are then shaped using precision instruments, allowing them to be properly sealed later in the procedure.

This stage is essential for preventing future infection.

Step 6: Filling the Root Canals

After the canals have been cleaned and dried, they are filled with a rubber-like material called gutta-percha.

This material seals the canals, preventing bacteria from re-entering the tooth.

A temporary or permanent filling is then placed to close the opening.

Step 7: Restoring the Tooth

In many cases, a tooth that has undergone root canal treatment will need a dental crown.

A crown protects the weakened tooth, restores its strength and improves its appearance. It also reduces the risk of the tooth cracking in the future.

Your dentist will advise whether a crown is recommended for your particular tooth.

Does Root Canal Treatment Hurt?

One of the biggest misconceptions is that root canal treatment is painful.

In reality, the procedure is carried out under local anaesthetic, meaning you should feel little to no pain during treatment. Many patients say the experience is similar to having a routine filling.

Some mild soreness or tenderness is normal for a few days afterwards, particularly when biting, but this can usually be managed with over-the-counter pain relief recommended by your dentist.

How Long Does the Procedure Take?

Most root canal treatments take between 60 and 90 minutes per appointment.

Simple cases may be completed in one visit, while more complex infections or teeth with multiple root canals may require two appointments.

Your dentist will explain the expected treatment plan before you begin.

What Happens After Treatment?

Following root canal treatment, it’s normal to experience mild sensitivity for a few days.

To aid recovery:

• Avoid chewing on the treated tooth until your permanent restoration has been placed.
• Brush and floss as normal.
• Take any prescribed medication as instructed.
• Attend any follow-up appointments recommended by your dentist.
• Contact your dental practice if swelling or severe pain develops.

Most patients return to their normal daily activities immediately after treatment.

How Successful Is Root Canal Treatment?

Root canal treatment has a very high success rate, often exceeding 90%.

With good oral hygiene and regular dental check-ups, a treated tooth can continue functioning for many years and, in many cases, for a lifetime.

Maintaining regular professional cleanings and addressing any dental concerns promptly will help protect both the treated tooth and your overall oral health.

Can Root Canal Treatment Be Avoided?

While not every case can be prevented, maintaining good oral hygiene significantly reduces your risk of needing root canal treatment.

You can protect your teeth by:

• Brushing twice a day with fluoride toothpaste.
• Cleaning between your teeth daily using floss or interdental brushes.
• Limiting sugary foods and drinks.
• Wearing a mouthguard during contact sports.
• Attending regular dental check-ups and hygienist appointments.
• Seeking treatment promptly if you notice tooth pain or damage.

Early treatment of tooth decay often prevents infection from reaching the dental pulp.

Frequently Asked Questions

Is it better to have a root canal or remove the tooth?

Whenever possible, dentists aim to preserve your natural teeth. Root canal treatment allows the infected tooth to be saved, helping maintain your natural bite, appearance and chewing ability. Tooth extraction is generally considered only when the tooth cannot be restored.

Can I drive home afterwards?

Yes. As the treatment is usually carried out using local anaesthetic, most patients are able to drive themselves home unless they have received sedation.

Will I need antibiotics?

Not always. Root canal treatment removes the source of the infection, so antibiotics are only prescribed if the infection has spread beyond the tooth or if there is significant swelling.

How long will the treated tooth last?

With proper care, good oral hygiene and regular dental check-ups, a root canal-treated tooth can last for many years and often for the rest of your life.

Final Thoughts

Although the thought of root canal treatment may seem daunting, modern dentistry has made the procedure safe, effective and comfortable. The primary goal is to remove infection, relieve pain and preserve your natural tooth whenever possible.

If you’re experiencing persistent tooth pain, sensitivity or swelling, don’t ignore the symptoms. Booking an appointment with your dentist as soon as possible can help prevent further complications and may save your natural tooth. Early diagnosis and treatment are always the best approach to maintaining a healthy, confident smile.