By the Lakehurst Dental Team · Medically reviewed by Brian S. Klohn, DMD, University of Pennsylvania School of Dental Medicine, 1991 · Lakehurst Dental, 19 Union Avenue, Lakehurst, NJ
Quick Answer
For most patients, a root canal does not hurt more than having a filling placed. The area is numbed with local anaesthetic before treatment begins. The pain people associate with root canals is usually the pain of the infected or inflamed nerve before treatment — and relieving that pain is the point of the procedure. Mild tenderness for a few days afterwards is normal and usually manageable with the pain relief your dentist recommends.
What This Article Covers
- Why a Root Canal Becomes Necessary
- What the Procedure Actually Involves
- What You Will Feel During Treatment
- Recovery: The First Few Days
- How Long the Treated Tooth Lasts
- What Happens If You Do Nothing
- Signs You Should Be Examined Promptly
- Frequently Asked Questions
Why a Root Canal Becomes Necessary
Inside every tooth is a chamber containing soft tissue — the pulp — made up of nerves and blood vessels. When decay reaches that chamber, or when a tooth is cracked or heavily damaged, bacteria can reach the pulp and it becomes inflamed or infected.
Once that happens, the tissue does not recover on its own. The infection has nowhere to drain, pressure builds inside a rigid tooth, and that pressure on the nerve is what produces the severe, throbbing toothache people associate with needing root canal therapy.
Left untreated, the infection can spread beyond the root tip into the surrounding bone. That is why the realistic comparison is not root canal versus nothing — it is root canal versus losing the tooth.
What the Procedure Actually Involves
The tooth and surrounding tissue are numbed with local anaesthetic. Your dentist waits until the area is fully numb before beginning — if you can still feel sharpness, say so, because more anaesthetic can be given.
An opening is made in the top of the tooth to reach the pulp chamber. The inflamed or infected tissue is removed, and the narrow canals inside the roots are cleaned and shaped. The canals are then filled and sealed to prevent bacteria re-entering.
Because a treated tooth has had its internal structure removed, it is more brittle than an intact tooth. A crown is frequently recommended afterwards to protect it from fracture under chewing forces.
What You Will Feel During Treatment
With effective anaesthetic, patients typically feel pressure and movement rather than pain. You will be aware that work is happening, in the same way you are during a filling, but the sharp sensation of an exposed nerve should not be present.
Anaesthetic can be harder to achieve in a tooth with an active, acute infection, because inflamed tissue changes the local chemistry. Dentists have techniques to address this. It is one reason not to delay treatment until the infection is at its worst.
If anxiety is the barrier rather than pain itself, tell the practice before your appointment. Knowing what will happen, agreeing a signal to pause, and allowing enough time all make a genuine difference.
Recovery: The First Few Days
It is normal for the tooth and the surrounding gum to feel tender for a few days, particularly when biting. The ligament that suspends the tooth in its socket has been disturbed, and that inflammation settles gradually.
Your dentist will advise on pain relief appropriate for you and your medical history. Chewing on the other side while the tooth settles, and avoiding very hard foods, reduces discomfort.
Severe pain, swelling that is increasing, or a fever are not part of normal recovery. Contact the practice if any of those occur.
How Long the Treated Tooth Lasts
A properly treated and properly restored tooth can serve for many years. Two factors matter most: that the canal system was thoroughly cleaned and sealed, and that the tooth is protected from fracture afterwards, usually with a crown.
The tooth still needs the same care as any other. The root filling does not prevent decay in the remaining tooth structure at the gum line, so brushing, flossing and regular checkups remain essential.
If you grind or clench your teeth, the additional force is a genuine risk to a restored tooth, and a night guard may be advised.
What Happens If You Do Nothing
An infected pulp does not resolve without treatment. Pain may temporarily subside when the nerve tissue dies, which patients sometimes mistake for improvement, but the infection continues in the bone around the root tip.
The realistic outcomes without treatment are ongoing or recurring infection, spreading infection, and eventually extraction of the tooth. Replacing an extracted tooth with an implant or bridge is more involved than saving the natural tooth.
That is the practical case for treatment: it is the option that keeps your own tooth in your mouth.
Signs You Should Be Examined Promptly
Persistent toothache, pain that wakes you at night, lingering sensitivity to hot or cold that continues after the stimulus is removed, pain on biting, a darkening tooth, or a tender swelling on the gum near a tooth all warrant examination.
Not every one of these means a root canal is needed. Some have simpler explanations. But each is a signal that something has changed inside or around the tooth, and the earlier it is assessed, the more options usually remain.
If facial swelling develops, or swelling affects your ability to swallow or breathe, that requires urgent medical attention rather than waiting for a routine appointment.
Frequently Asked Questions
For most patients, no more than having a filling. The tooth and surrounding tissue are numbed with local anaesthetic first, so the sensation is usually pressure rather than pain. Tell your dentist if you feel any sharpness, as further anaesthetic can be given.
The pain comes from inflamed or infected tissue inside a rigid tooth, where pressure has nowhere to escape and presses on the nerve. Relieving that pressure and removing the infected tissue is what the treatment does.
It depends on which tooth is involved and how many canals it has. Front teeth generally have fewer canals than molars. Some cases are completed in one visit and others across two. Your dentist can tell you what to expect for your tooth.
Often, yes, particularly for back teeth. Removing the internal tissue leaves the tooth more brittle, and a crown protects it against fracture under chewing forces. Your dentist will advise based on how much sound tooth structure remains.
Mild tenderness when biting for a few days is typical, then it settles. Increasing swelling, severe pain or fever are not normal and should prompt a call to the practice.
Keeping a natural tooth is generally preferable where it can be predictably saved, because a natural root maintains the bone and no replacement is needed. Where a tooth is too damaged to restore, extraction and replacement may be the better plan. That judgement requires an examination.
It can. Causes include canals that could not be fully cleaned, new decay reaching the sealed area, or fracture of the tooth. Retreatment is sometimes possible. Protecting the tooth with a crown and keeping up routine checkups reduce the risk.
Speak With a Dentist in Lakehurst
If you have a toothache, or a tooth that has become sensitive to hot and cold and stays sore afterwards, do not wait for it to worsen. Lakehurst Dental has cared for families in Lakehurst, Toms River and across Ocean and Monmouth counties for more than 34 years. To ask a question or arrange a consultation, call (732) 943-4090 or contact our office.
This article is general information and is not a substitute for an examination and personal advice from your dentist.