A root canal is a procedure that removes infected tissue from inside your tooth, cleans the space, and seals it to prevent further damage. Most root canals take 60 to 90 minutes, though some require a second visit. It’s one of the most common dental procedures, and understanding what happens at each stage can make the experience far less intimidating.
Why a Root Canal Becomes Necessary
Beneath the hard enamel of your tooth sits a soft core called the pulp. This tissue contains nerves, blood vessels, and connective tissue that supply nutrients to the outer layers of the tooth. When bacteria reach the pulp, whether through a deep cavity, a crack, or repeated dental work, the tissue becomes inflamed. Dentists call this pulpitis.
Early pulpitis is reversible. You might feel a quick zing of sensitivity to cold that fades within seconds. But once the inflammation progresses, the sensitivity lingers. The key warning sign is pain from heat or cold that sticks around for more than a few seconds, often as a throbbing or sharp ache. At that point, the pulp can’t heal on its own, and the two options are a root canal or pulling the tooth entirely.
What Happens During the Procedure
The process follows a predictable sequence, and knowing each step removes most of the mystery.
First, your dentist or endodontist numbs the area with local anesthesia. If you’re anxious, you may also receive medication to help you relax, or nitrous oxide (laughing gas) to take the edge off. Nitrous oxide also improves the effectiveness of the numbing injection, which is why many providers offer it.
Once you’re numb, a small sheet of rubber called a dental dam is placed over the tooth. This keeps the area dry and free of saliva during the work. Your dentist then drills a small opening through the top of the tooth to reach the pulp chamber inside.
Using tiny, flexible instruments made from nickel-titanium, the dentist removes the infected or dead pulp tissue from the chamber and the narrow canals that run down each root. These canals are then cleaned, shaped, and disinfected to eliminate any remaining bacteria. This is the most time-consuming part of the procedure, especially in molars, which can have three or four canals compared to a front tooth’s single canal.
After the canals are clean, they’re filled with a rubbery material called gutta-percha, which seals the space and prevents reinfection. A temporary filling closes the opening in the crown. In most cases, you’ll return for a separate appointment to have a permanent restoration placed.
Pain: What You’ll Actually Feel
The procedure itself should be painless. Modern local anesthesia is highly effective, and when standard injections aren’t enough, dentists have supplemental techniques that achieve numbness in over 90% of difficult cases. Teeth with active infections can sometimes be harder to numb, which is why your provider may use additional injection sites or nitrous oxide to ensure you’re comfortable before starting.
After the numbness wears off, you can expect some soreness around the tooth for a few days. This is inflammation from the procedure itself, not a sign that something went wrong. Over-the-counter ibuprofen and acetaminophen, taken together, are typically the most effective combination for managing post-procedure discomfort. Most people return to normal activities the next day.
Why You’ll Likely Need a Crown
A root canal saves the tooth, but it also leaves it more fragile. Removing the pulp cuts off the tooth’s blood supply, which means the remaining structure becomes drier and more brittle over time. The access hole drilled during the procedure also reduces the amount of solid tooth left.
Crowns are most commonly recommended for molars and premolars because these teeth absorb the majority of your chewing pressure and are the most likely to fracture after treatment. Front teeth sometimes get by with a standard filling if enough healthy structure remains and the bite forces on that tooth are low. Your dentist will base the decision on the tooth’s location, how much natural tooth is left, and how it functions within your bite.
The crown is usually placed at a follow-up visit, sometimes a few weeks after the root canal. Until then, you’ll have a temporary filling or temporary crown in place.
Recovery and Eating After Treatment
For the first few days, stick to soft foods and avoid anything at extreme temperatures. Your gums and the treated tooth may be sensitive to heat and cold while they heal. Sticky foods like taffy and gum can pull out a temporary crown, and hard foods like nuts, ice cubes, or hard candy risk chipping the tooth before it’s permanently restored.
You can brush and floss normally right away, just be gentle around the treated area. Most people feel fully back to normal within a week, though the tooth may feel slightly different from the surrounding teeth for a bit longer as the ligament around the root settles down.
What It Costs
The price of a root canal depends primarily on which tooth needs treatment, because molars are more complex and take longer. Based on Delta Dental data, typical out-of-network costs break down like this:
- Front tooth: $620 to $1,100
- Premolar: $720 to $1,300
- Molar: $890 to $1,500
These figures don’t include the crown, which is a separate cost. Most dental insurance plans cover a portion of both the root canal and the crown, though the specifics vary widely by plan. If you’re paying out of pocket, many dental offices offer payment plans, and in-network providers will charge less than the ranges listed above.