Tooth Nerve Exposed: What It Means and What to Do Now
An exposed tooth nerve is painful, and it needs a dentist’s attention soon. The nerve sits inside the tooth in a soft tissue called the pulp. When decay, a crack, a fracture or worn-away enamel and gum opens a path to it, hot, cold, sweet foods and even air can cause sharp pain. In many cases the tooth can still be saved. If you are in pain in Ottawa, we see emergencies and accept new patients, and you can reach us through mersaldental.ca.
TL;DR
A truly exposed nerve (pulp) usually comes from deep decay, a cracked or broken tooth, or trauma. Exposed dentin or an exposed root is related but is not the same thing.
Constant or severe tooth pain means you should call a dentist right away, according to the Ontario Dental Association.
Do not place pain tablets on the tooth, and do not apply heat to your jaw.
Depending on the diagnosis, a dentist can cover the exposure, perform pulp capping, do a root canal, or, if the tooth cannot be restored, remove it.
The sooner the tooth is covered and sealed, the better the chance of keeping it.
Table of Contents
What “exposed nerve” really means
People use the phrase for three different situations. They feel alike at first, but they are treated differently.
Exposed dentin. Under the hard outer enamel is dentin, a layer with tiny channels that lead toward the nerve. When enamel wears away or the gum pulls back, those channels are open to temperature and touch. This is the most common cause of sharp, short pain from cold drinks or brushing.
Exposed root. The root is normally covered by gum. When gums recede, the root surface shows. Root surfaces have no enamel, so they are sensitive.
Exposed pulp. This is the nerve and blood supply itself. Deep decay, a crack, or an injury breaks through the dentin and reaches the pulp. Bacteria can then enter the pulp chamber and cause inflammation or infection.
Dentists sort these out with a careful history and an exam. According to the Journal of the Canadian Dental Association, they look for exposed dentin, decay, defective fillings or trauma, tap on the tooth, test it with cold and heat, and take X-rays when needed. You cannot reliably tell the difference by looking in a mirror, which is why an exam matters.
What causes an exposed nerve or dentin
The cause decides the treatment, so it helps to know the common ones.
Causes of exposed dentin and roots
The Ottawa Dental Society lists gum disease, clenching or grinding, vigorous brushing, abrasive toothpaste, and whitening or tartar-control products. A Canadian evidence review on tooth hypersensitivity names gum recession as a common cause. It also lists aggressive brushing, abrasive toothpaste, poor plaque control, periodontal disease, facial piercings, anatomical factors and orthodontic treatment as contributors.
If you want a plain-language overview of the everyday causes of tooth sensitivity, including how brushing habits play a part, that is a good place to start. Changing your habits will not close an open nerve, but it can protect the teeth that are still healthy.
Causes of exposed pulp
Deep decay. A cavity that grows through enamel and dentin eventually reaches the pulp.
A cracked or broken tooth. A chip or fracture can open the pulp directly.
Trauma. A blow to the mouth can break a crown portion of a tooth and expose dentin or pulp.
A failing filling. A defective restoration can let bacteria seep underneath. The JCDA lists defective restorations among the things dentists check for.
If one tooth has suddenly turned sensitive, our article on what to do when one tooth is suddenly sensitive walks through the likely reasons.
Symptoms: how pain tells the stages apart
The pattern of pain gives a dentist useful clues. The JCDA describes reversible pulpitis as pain to temperature or sweet changes that does not linger. Irreversible pulpitis can cause intense pain that lingers, pain that starts on its own, and pain that spreads or is felt elsewhere in the face or jaw.
What you notice | What it can suggest | What to do |
Brief sharp pain with cold or sweet, gone within seconds | Exposed dentin or reversible pulp irritation | Book an exam soon |
Pain that lingers after hot or cold, or wakes you at night | The pulp may be inflamed beyond recovery | Call a dentist right away |
Pain when you bite or when the tooth is tapped | Crack, infection or inflammation around the root | Call a dentist right away |
Fever or swelling of the face | Spreading infection | Seek urgent dental or medical care |
As a guide, the JCDA describes pain that fades within 30 seconds of a cold test, with no spontaneous pain or tap sensitivity, as compatible with reversible pulpitis. Pain that lingers longer than 30 seconds, pain with heat, spontaneous pain, or tap sensitivity may point to irreversible pulpitis. Only a dentist can make that diagnosis, so use this as a reason to call, not a way to self-diagnose.
If cold is your main trigger, our guide to treating cold sensitive teeth explains the next steps.
What you can safely do while you arrange care
The goal is comfort and protection until the dentist can see you. None of this replaces treatment.
Call a dentist promptly. For constant or severe mouth pain, the ODA advises calling a dentist immediately.
Keep pain tablets off the tooth. The ODA advises against putting them on the tooth or gum.
Do not use heat on your jaw. A heating pad or hot-water bottle can make dental pain or swelling worse, says the ODA.
Eat soft foods and avoid irritants. For a broken tooth, Alberta Health Services suggests soft foods and warm salt-water rinses after meals. It also advises avoiding salty, spicy, citrus and tomato-based foods.
Avoid very hot or very cold contact. The same guidance says to keep extreme temperatures away from an exposed pulp.
Cover the area if the tooth is broken. Alberta Health Services mentions temporary filling material over exposed pulp until you can be seen.
Ask about pain medicine. Alberta Health Services advises checking with your doctor or pharmacist whether acetaminophen, ibuprofen or naproxen is safe for you, and following the label.
The ODA says antibiotics should only be used when there is fever or swelling of the face. They are not a substitute for dental treatment, and a dentist decides whether you need them.
For milder sensitivity without constant pain, desensitizing toothpaste is a standard first step. The JCDA consensus recommendations suggest daily desensitizing toothpaste, brushed at least twice a day, after removing or changing the habits that caused the exposure. You can compare options in our guide to sensitive teeth toothpaste, and a mouthwash for sensitive teeth may help too.
How a dentist covers or treats an exposed nerve
Treatment depends on how deep the problem goes and whether the nerve is still healthy. Here is what to expect, from the gentlest option to the most involved.
Exposed dentin: seal and protect
When the pulp is not involved, the aim is to close the open channels. A Canadian evidence-based review reports in-office options such as varnishes, resin sealers, glass ionomers, dentin adhesives and lasers. The Ottawa Dental Society mentions sealants, desensitizing ionization and fluoride-containing filling materials. A damaged or decayed area can also be repaired with a filling. See our restorations page for how we approach fillings.
The JCDA consensus frames this as cause control first. If recession, erosion or heavy brushing pressure continues, symptom treatments may only help for a short time. That is why we look at your habits and gums as well as the sensitive tooth. For more detail, see treatment for sensitive teeth.
Exposed pulp with a healthy nerve: pulp capping
The Canadian Academy of Endodontists’ Standards of Practice say pulp capping can be appropriate for an exposed vital pulp when symptoms fit reversible pulpitis, bleeding can be controlled, vital tissue is present, a proper seal can be kept, and there is no infection at the root tip. In those cases the dentist places a protective material over the exposure and seals the tooth.
Broken tooth with exposed dentin or pulp
After a crown fracture, the JCDA says exposed dentin can be covered with glass ionomer or bonding and composite resin. Pulp capping or a partial pulpotomy may keep the nerve alive in young patients, while root canal treatment is the treatment of choice in adults. It is also needed if the pulp dies. The same article shows why speed matters: untreated exposure can move from a repairable situation to a dead nerve that needs root canal treatment.
A heavily damaged tooth is often protected afterward with a crown. Our crowns and bridges page explains how that works.
Inflamed or infected nerve: root canal or extraction
For irreversible pulpitis, the JCDA lists pulpectomy, root canal treatment where appropriate, or extraction. The Canadian Academy of Endodontists explains that endodontic therapy removes diseased pulp, cleans and disinfects the canals, and seals them with filling material. A tooth with exposed pulp can therefore often be saved when enough healthy structure remains and the diagnosis allows it.
Root canal treatment has a reputation for being painful, but its purpose is to remove the source of pain and keep your own tooth. Learn more on our root canal treatment page.
Sometimes a tooth is too damaged to restore. We then discuss extractions, and afterward options to replace the tooth, such as implants.
When it is urgent
Call a dentist the same day if you have any of the following:
Constant or severe tooth or mouth pain.
Pain that wakes you at night or keeps lingering after hot or cold.
A broken tooth with a visible pink or red spot, or bleeding inside.
Swelling of the face or gums, or a fever.
If you cannot reach a dentist and you have facial swelling or fever, go to an emergency department. The ODA notes that bleeding from a badly bitten lip or tongue that does not stop also needs hospital care.
Waiting for the pain to pass can feel tempting, especially if it eases. Easing can mean the nerve is dying, not healing, and the infection can still be there.
Our perspective
Most people who come to us with a possible exposed nerve have waited, hoping it would settle. We understand. Dental pain is stressful, and the fear of a drill makes it worse. Our view is simple: the earlier we see the tooth, the more options you have. A small exposure can sometimes be sealed with a filling. A deeper one may need a root canal, which is designed to keep your own tooth and end the pain. Extraction is the option when a tooth truly cannot be saved, and we aim to do it gently. We offer same-day treatment and emergency care so that pain does not have to wait for a convenient week. Our multilingual team will explain each step in plain words, and we handle direct billing to insurance, including CDCP and IFHP, so cost questions do not delay the visit. Mersal
Get seen in downtown Ottawa
We are a family dental office in downtown Ottawa, accepting new patients. We provide emergency dental care, same-day treatment, fillings, crowns, root canal treatment and extractions, with direct insurance billing and CDCP and IFHP accepted. Tell us when you book that you have tooth pain, and we will work to see you quickly. Start on our emergency dental care page.
If you have a cracked tooth but are not in severe pain, book an exam anyway. A small crack that is sealed or covered early is usually simpler to treat than one that has reached the nerve.
FAQ
Can an exposed tooth nerve heal on its own?
A small area of exposed dentin can become less sensitive with desensitizing products and better habits. A nerve that is truly exposed by decay or a fracture will not close on its own, and bacteria can keep entering the tooth. Have a dentist examine it so the exposure can be covered or treated.
Can a dentist cover an exposed nerve?
Yes, in the right situation. If the pulp is still healthy and can be sealed properly, the Canadian Academy of Endodontists describes pulp capping as an option. If the nerve is inflamed beyond recovery or infected, a root canal is usually the way to keep the tooth.
What can I do for exposed dentin pain at home?
Use a desensitizing toothpaste twice a day, brush gently, and cut back on acidic foods, as the Ottawa Dental Society suggests. Avoid very hot or cold items. If the pain is constant or severe, call a dentist instead of waiting.
Does an exposed nerve always mean a root canal?
No. Exposed dentin is often treated with sealing or a filling, and some pulp exposures can be capped. A root canal is for a nerve that is infected or too inflamed to recover. Your dentist decides after an exam and X-rays.
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