What Happens During a Root Canal Procedure?

A root canal treatment, or endodontic therapy, is a procedure designed to save a tooth that has become infected or inflamed deep inside. When the soft tissue at the center of a tooth—the pulp—is damaged by decay, cracks, or trauma, it can cause severe pain and eventually lead to an abscess. At Alameda Dental in Aurora, CO, we perform root canals to remove the source of the infection, relieve discomfort, and restore the tooth so it can function normally for years. This article explains each part of the process, from initial evaluation to final restoration, so you know exactly what to expect.

01 / Why the pulp becomes a problemWhy the pulp becomes a problem

Inside every tooth, beneath the enamel and dentin, is a chamber and narrow canals that house the pulp. The pulp contains nerves, blood vessels, and connective tissue that help the tooth develop. In a healthy tooth, the pulp is well-protected. But when bacteria reach it—often through a deep cavity, a crack, or a loose filling—the tissue becomes inflamed. Because the tooth’s rigid walls cannot expand, that inflammation creates pressure on the nerve, causing throbbing pain or sensitivity to hot and cold that lingers.

If left untreated, the inflammation can progress to necrosis, where the pulp tissue dies. Bacteria multiply within the canal system and can escape through the tip of the root into the surrounding bone, forming an abscess. At this stage, antibiotics alone cannot cure the problem because they cannot reach the dead tissue inside the tooth. The only way to eliminate the infection is to physically remove the pulp, disinfect the canals, and seal the space.

02 / How we diagnose the need for a root canalHow we diagnose the need for a root canal

Not every toothache means you need a root canal. When you visit us with pain or other symptoms, we begin with a careful examination. We’ll ask about your symptoms—such as constant aching, pain when biting, or sensitivity that hangs around after the trigger is gone. We gently tap on the tooth and press around the gum to check for tenderness or swelling. We also take X-rays to see the shape of the roots, how far decay extends, and whether there are any changes in the surrounding bone that suggest infection.

Sometimes additional tests help us distinguish between a tooth that needs a root canal and other conditions like a sinus infection, a cracked tooth, or nerve pain from elsewhere. Once we confirm that the pulp is irreversibly damaged or already dead, we explain the situation and recommend endodontic treatment. The alternative is typically extracting the tooth, which then requires a replacement like a bridge or implant. Whenever the tooth is structurally sound enough to save, we believe a root canal is the preferred path.

03 / What happens during the root canal procedureWhat happens during the root canal procedure

A root canal may be completed in one or two visits, depending on the complexity of the tooth’s anatomy and the severity of infection. Below is a typical step-by-step outline.

Step 1: Numbing and isolation

We start by applying a topical gel to the gums and then injecting a local anesthetic to completely numb the tooth and surrounding area. Many patients are surprised by how comfortable this step is. Once you’re fully numb, we place a thin, flexible sheet called a dental dam over the tooth. The dam isolates the tooth, keeps it dry and saliva-free, and prevents any debris or irrigating solutions from entering your mouth.

Step 2: Accessing the pulp

We create a small opening through the top of the tooth—on the chewing surface of a back tooth or the back of a front tooth—to reach the pulp chamber. This access is precise, removing only enough tooth structure to find and clean the canals while preserving as much healthy tooth as possible.

Step 3: Cleaning and shaping the canals

Using tiny instruments known as endodontic files, we gently remove the infected or dead pulp tissue from each canal. The number of canals varies: front teeth often have one, while molars may have three or more. As we work, we flush the canals with antimicrobial solutions to dissolve debris and kill bacteria. The files also shape the canals into smooth, tapered forms so they can be filled evenly later. We may pause to take X-rays to confirm we’ve reached the full length of each canal and that no infected tissue remains.

Step 4: Medication (if needed)

If the tooth had a large infection or abscess, we may place a medication inside the canals and close the tooth with a temporary filling. This allows healing to take place between visits. In many straightforward cases, we can proceed to fill the canals in the same appointment.

Step 5: Filling the canals

Once the canals are thoroughly clean and dry, we fill them with a biocompatible material called gutta-percha. This rubber-like substance is warmed and compacted into the shaped canals along with a sealer, forming a tight, three-dimensional seal. The goal is to block any future bacteria from re-entering the canal system. A temporary or permanent filling is then placed in the access opening.

Step 6: Restoring the tooth

After a root canal, the tooth becomes more brittle over time because its internal blood supply has been removed. To protect it from fracture and restore full function, almost every root-canaled tooth eventually needs a crown. We usually wait a short period to ensure the tooth is symptom-free, then prepare the tooth for a custom crown that covers and reinforces it. For some front teeth with minimal structural loss, a bonded filling may be enough, but crowning is standard for back teeth that endure heavy chewing forces.

04 / What you feel during and afterwardWhat you feel during and afterward

During the procedure, you should feel pressure but not sharp pain, thanks to the local anesthetic. If at any point you feel discomfort, you can alert us and we’ll adjust the numbing. Many patients listen to music or just relax while we work.

After the numbness wears off, it’s normal to have some mild soreness or tenderness when chewing on the treated tooth. This usually resolves within a few days and can be managed with over-the-counter pain relievers, following the instructions we provide. If significant swelling or pain persists beyond a few days, contact our office. Once the final crown is placed, the tooth should feel like any other tooth. You can bite, chew, and clean it normally.

01 / Root canal success and long-term outlookRoot canal success and long-term outlook

When performed carefully and followed by a well-fitting restoration, root canals have a very high success rate. The tooth can remain in service for many years—often for a lifetime—as long as you maintain good oral hygiene and attend regular check-ups. Success depends on removing all infected tissue, thoroughly disinfecting the canal system, achieving a complete seal, and protecting the tooth with a crown that prevents reinfection from the top.

Occasionally, a root canal may not heal as expected. This can happen if a microscopic canal was missed, if the crown leaks, or if new decay develops. In those cases, retreatment or a minor surgical procedure (apicoectomy) may be possible to save the tooth. We monitor treated teeth at your routine visits to catch any problems early.

02 / When to seek treatmentWhen to seek treatment

Contact our office if you experience any of the following symptoms, as they may indicate pulp damage that requires a root canal:

• Persistent tooth pain, especially pain that wakes you up at night
• Prolonged sensitivity to heat or cold (pain that lingers after the stimulus is removed)
• Discoloration or darkening of a single tooth
• Swelling or tenderness in the gums or face
• A small bump on the gum that may drain fluid (a draining sinus tract)

Prompt evaluation gives us the best chance to save the tooth with a root canal rather than losing it to extraction. Delaying treatment often allows the infection to spread, destroying more bone and making the tooth harder to save.

03 / Root canal vs. extraction: making the choiceRoot canal vs. extraction: making the choice

Whenever possible, we recommend saving your natural tooth. Keeping your own root preserves the surrounding jawbone and avoids shifting of neighboring teeth. A root canal followed by a crown is generally less involved than extracting the tooth and replacing it with an implant or bridge, and the healing period is typically shorter.

Extraction may be the better choice if the tooth is severely cracked below the gumline, if decay has compromised so much structure that a crown cannot be securely placed, or if the canals are blocked or abnormally shaped in a way that prevents thorough cleaning. We’ll discuss the pros and cons of each option with you before making a decision.

04 / Common questions about root canalsCommon questions about root canals

Will the procedure hurt? The infection is the source of pain; the root canal removes it. With modern anesthesia, most patients find the experience no more uncomfortable than having a filling.

How long does the appointment take? The length varies by tooth and complexity. A straightforward anterior tooth may take less time than a multi-canaled molar, but you should plan on being in the chair for one to two hours or possibly spread over two visits.

Can I eat after the appointment? Wait until the numbness is completely gone to avoid biting your cheek or tongue. Stick to soft, cool foods for the first day, and avoid chewing on the treated side until the permanent crown is placed.

Will the tooth look different? In most cases, a crown will cover the tooth and match your surrounding teeth, so appearance is not affected. If a front tooth is treated without a crown, internal bleaching techniques can be used to keep its shade consistent with the rest of your smile.

Do I need a crown after every root canal? Almost always, especially on back teeth. The crown provides strength and seals the tooth against reinfection. We’ll explain the recommendation based on your specific tooth.

05 / Aftercare and home tipsAftercare and home tips

After each visit, follow the written instructions we give you. Generally:

• Take any recommended over-the-counter anti-inflammatory medication as directed, unless your physician advises otherwise.
• Rinse gently with warm salt water (half teaspoon of salt in a cup of water) beginning the day after treatment.
• Avoid chewing on the treated side until the final crown is seated.
• Contact us if swelling increases, if you have a reaction to medication, or if pain is not improving after a few days.

Once the crown is placed, care for the tooth just like your other teeth: brush twice a day, floss daily (including around the crown margin), and keep up with professional cleanings.

06 / When to call usWhen to call us

Call Alameda Dental at (303) 343-7072 if you have any of the symptoms mentioned above or if you’ve been told you need a root canal and have been putting it off. We’ll schedule an exam, explain your options clearly, and guide you through each step so you can move forward with confidence.