Irreversible Vs Reversible Pulpitis In Children: A Parent’s Guide

Your child’s toothache can start with sensitivity to cold drinks or a sharp sting when biting down. Sometimes the pain fades quickly, but other times it may linger and even worsen. According to our Kids’ Dentist, the difference comes down to what’s happening inside your child’s tooth—specifically, whether the inflamed nerve can still recover. Dentists use two terms to describe this: reversible pulpitis and irreversible pulpitis in children. One type responds to straightforward treatment. The other requires a different approach entirely. Let us explain more so that you can understand the difference.

child having her teeth checked at the dentist

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What Is Pulpitis?

As our Brisbane dentists explain, pulpitis is inflammation of the pulp—the soft tissue inside your child’s tooth that contains nerves and blood vessels. When a cavity goes deep or a tooth gets knocked, bacteria can reach this inner part. The pulp swells, just like a twisted ankle swells. But here’s the problem: the pulp sits trapped inside the hard shell of the tooth. That swelling creates pressure. The pressure presses on the nerve, and so your child feels pain. Whether that pulp can bounce back or whether it’s damaged beyond repair determines which type of pulpitis your child has.

If your child is experiencing severe tooth pain, you can call our Emergency Dentist in Brisbane and book an appointment.

Reversible

If your child’s Brisbane paediatric dentist has mentioned that your child has a reversible pulpitis, it means that the nerve is irritated but can still heal. Your child might wince when they bite into something cold or sweet. The pain is sharp but brief. Once the ice cream is gone, so is the discomfort. This happens when a cavity has gotten close to the pulp but hasn’t broken through yet. In this case, we remove the decay, place a filling, and the pulp calms down. Once the inflammation goes away, your child’s tooth can return to normal. Catching pulpitis at this stage matters because waiting too long can turn pulpitis into irreversible.

Irreversible Pulpitis

In this type of pulpitis, the damage has gone too far, and bacteria have invaded the pulp chamber, or the blood supply to the nerve has been cut off. Your child probably experiences intense throbbing that won’t quit—even when they’re not eating or drinking. The pain often gets worse at night, or it can wake them from sleep, and paracetamol barely helps. At this point, filling the cavity won’t solve the problem. Dr Ellie Nadian explains that we typically have to remove the infected pulp tissue through a pulpectomy (for baby teeth) or root canal therapy (for permanent teeth).

In severe cases where too much tooth structure is damaged or infection has spread extensively, the tooth may need to be extracted.

What Causes Pulpitis In Children

According to Dr Roya Moulavi, a dentist in South Perth, most cases of pulpitis start with tooth decay. Bacteria eat through the enamel, then the layer underneath, until they reach the pulp. But decay isn’t the only culprit.

Here’s what may lead to pulpitis in children:

Untreated cavities: This is the most common cause of pulpitis in children. Sugar from food and drinks feeds bacteria in the mouth, and those bacteria produce acid that dissolves the tooth’s protective layers. When a cavity goes deep enough, bacteria reach the pulp, and the body responds with inflammation. Shallow cavities usually cause reversible pulpitis, while deep ones lead to irreversible damage.
Falls and accidents: Your child trips on the footpath, gets hit in the face during sport, or bites down on something hard. The impact can bruise or injure the pulp inside the tooth. Sometimes the damage shows up immediately, but other times it develops days or weeks later. The tooth may look fine from the outside, while the nerve inside is dying.
Cracks in the tooth: These happen from grinding teeth at night, chewing on hard objects like pencils or ice, or from old fillings that weaken the tooth structure. Bacteria seep through the cracks and infect the pulp. Parents or caregivers may miss these because the cracks can be hairline-thin and hard to spot.
Repeated dental work: Each time a dentist drills on a tooth, it creates heat and vibration. The pulp can handle this once or twice, but if the same tooth needs multiple fillings or procedures, the repeated stress can push the nerve past its breaking point.
Poor oral hygiene and sugar: These aren’t direct causes, but they can accelerate everything. Children who don’t brush properly or who consume sugary drinks throughout the day create the perfect environment for decay to thrive, which means the decay progresses faster and reaches the pulp sooner.

child smiling showing decayed upper teeth

Warning Signs of Pulpitis In Children

Children cannot always explain pain clearly. While a child may just refuse to eat, another child might say their whole face hurts when it’s actually one tooth. Watch for these signs that may indicate something’s wrong:

Pain that won’t quit: Your child may complain about tooth pain that lasts longer than a day or two. The discomfort might be dull and constant, or sharp and throbbing. If paracetamol only takes the edge off, or if the pain keeps coming back, the pulp is likely involved.
Sensitivity to temperature: Your child may refuse to drink cold water, ice cream, or hot chocolate. With reversible pulpitis, the pain is brief and stops once the trigger is gone. With irreversible pulpitis, the sensitivity is more intense, and the pain lingers for minutes after they’ve finished eating or drinking.
Nighttime pain: Your child wakes up at 2 am crying about their tooth. Lying down increases blood flow to the head, which intensifies the throbbing. Pain that disrupts sleep usually signals irreversible pulpitis, not just a simple cavity.
Swelling around the tooth: You may notice redness or puffiness on the gum near the painful tooth. The area might feel tender when touched. This may suggest that the infection has spread beyond the pulp into the surrounding tissue.
A darker tooth: One tooth looks grey, brown, or yellow compared to the others. This colour change may happen when the pulp inside dies. The tooth might not hurt anymore because the nerve is dead, but the infection is still there.
Pain when chewing: Your child chews on one side of their mouth or avoids hard foods altogether. They might complain that it hurts to bite down. This pressure pain may mean the inflammation has reached the tissues around the root.
Visible cavity or hole: You can see a dark spot or an actual hole in your child’s tooth. If it’s big enough to trap food, it’s probably deep enough to affect the pulp.

a child holding his cheek indicating dental pain

How Dentists Test and Diagnose Which Type Your Child Has

We won’t guess which type of pulpitis your child has. Our paediatric dentists use specific tests to determine whether the nerve can still heal or is damaged beyond repair. Here’s what usually happens during the examination:

Visual examination: We look for visible cavities, cracks, or chips in the tooth and check the gum for swelling or redness. Sometimes the decay is obvious, but in some cases, it hides between teeth or under an old filling where you can’t see it.
Cold testing: A cotton bud dipped in refrigerant or an ice stick gets pressed against the tooth. Sharp pain that fades quickly, usullay suggests reversible pulpitis. Intense pain that lingers after removing the cold usually means irreversible pulpitis. (Keep in mind that cold testing is less reliable in baby teeth than in adult teeth, so your child’s dentist will always combine it with other checks before making a diagnosis.)
Heat testing: Warm water or a heated instrument sometimes reveals more than cold does. Pain triggered by heat that won’t go away is usually a strong sign of irreversible pulpitis. Healthy teeth don’t typically react this way to warmth.
X-rays: A X-ray can help us see what’s happening beneath the surface—how deep the decay goes, whether it’s reached the pulp chamber, and if infection has spread to the bone around the tooth’s roots.
Percussion test: Gently tapping on the tooth with a finger or instrument tells us if the inflammation has spread beyond the pulp to the tissues around the root. Sharp pain from tapping helps distinguish pulpitis from other dental problems.
Symptom questions: Does the pain wake your child at night? Does it happen without any trigger? How long does it last? A tooth that throbs spontaneously at 2 am behaves differently from one that only hurts with ice cream, and that pattern reveals what’s happening inside.
Bleeding observation: If we open the tooth to remove decay, we watch how the pulp bleeds. Healthy or reversibly inflamed pulp typically bleeds bright red and stops quickly. Irreversibly damaged pulp either doesn’t bleed or oozes dark blood that won’t stop, which often confirms the diagnosis right there. If the pulp doesn’t bleed at all, it may have already died, which is known as pulp necrosis.

All these tests together determine whether your child needs a simple filling or more involved treatment. We never rely on one test alone because it isn’t enough, and the full picture matters.

a dentist examining a child's teeth with the mother present next to the child

Treatment Options For Reversible Pulpitis

As we said before, in the reversible pulpitis, the nerve can still heal. So we remove what’s irritating the pulp and seal your child’s tooth so it can recover. Here’s what happens:

Removing the decay: We numb the area with local anaesthetic so your child only feels pressure, not pain. Then we use a drill to carefully remove the decayed parts of the tooth. In deep cavities close to the nerve, we may intentionally leave a thin layer of affected dentine to avoid exposing the pulp, as current evidence shows this can safely arrest the decay and allow the tooth to heal underneath a well-sealed restoration. This gets rid of the bacteria that were causing the inflammation. Once the decay is managed, the irritation stops, and the pulp can start settling down.
Placing a filling: After cleaning out the cavity, we fill the space with either composite resin (tooth-coloured material) or glass ionomer cement. The filling seals the tooth and prevents bacteria from getting back in. Most children do well with composite fillings because they look natural and bond strongly to the tooth structure.
Sedative filling (when needed): Sometimes we place a temporary filling first that contains medication to calm the inflamed nerve. We leave this in for a few weeks or months to give the pulp extra time to heal, then replace it with a permanent filling. This extra step helps if your child has been in significant pain or if the cavity was quite deep.
Pulpotomy for baby teeth: A pulpotomy is typically performed when decay removal results in a pulp exposure, but the pulp in the roots is still healthy and not irreversibly damaged. Under local anaesthetic, we open the tooth, remove the affected pulp tissue from the crown, and place medication such as MTA (mineral trioxide aggregate) over the remaining healthy root pulp, then seal it with a crown, which is the most effective long-term restoration. If, during the procedure, the root pulp shows signs of irreversible damage such as uncontrollable bleeding or pus, the tooth will need a pulpectomy instead. A pulpotomy works well for baby teeth because it keeps them in place until they fall out naturally.
Dental crown (for larger cavities): If the cavity was big and there’s not much tooth structure left after removing all the decay, a filling alone won’t be strong enough. We place a stainless steel crown over baby teeth or a tooth-coloured crown over permanent teeth. The crown protects what’s left of your child’s tooth and restores its shape and function.
Pain relief at home: We may recommend paracetamol or ibuprofen for any lingering discomfort after the appointment. Most children feel better within a day or two once the source of irritation is removed. If the pain persists or worsens, that might mean the pulpitis wasn’t reversible after all, and you’ll need to bring your child back.

The key with reversible pulpitis is acting quickly. The sooner we treat it, the better the chance the nerve bounces back completely.

paediatric dentists performing dental procedure on a child's teeth

Treatment Options For Irreversible Pulpitis

Irreversible pulpitis means the nerve can’t heal on its own, so a simple filling won’t fix the problem. The damaged or infected pulp tissue needs to come out, and the treatment depends on whether it’s a baby tooth or a permanent tooth, and how severe the damage is.

Here are the options:

Pulpectomy for baby teeth: This involves removing all the pulp from both the crown and the roots of the tooth. We clean out the empty canals, fill them with a material that dissolves as the baby tooth naturally sheds, then restore the tooth with a crown. We use this when infection has spread throughout the entire pulp or when a pulpotomy won’t be enough.
Root canal treatment for permanent teeth: Your child’s permanent tooth is worth saving, so we remove all the diseased pulp, clean and shape the canals inside the roots, then fill them with a rubber-like material called gutta-percha. The tooth stays in the mouth and functions normally even though it no longer has a nerve. Most permanent teeth need a crown afterwards to protect them from breaking.
Apexification for young permanent teeth: When a permanent tooth that hasn’t fully developed yet gets irreversible pulpitis, the root tips are still open, and we can’t fill them the normal way. We place medication inside the tooth to encourage the root tip to close over several months, then complete the root canal once that happens. This takes longer but saves the tooth. (In some cases, regenerative endodontic procedures may also be considered, which aim to restore living tissue inside the root canal rather than simply sealing it.)
Extraction: Sometimes the tooth is too badly broken down to save, the infection has destroyed too much bone, or the baby tooth will fall out soon anyway. We remove the tooth. For baby teeth lost early, we might need a space maintainer—a small appliance that holds the gap open so the permanent tooth has room to come through properly.

Pain and Anxiety Management

We use local anaesthetics for most dental procedures to protect your child from pain. If your child has dental anxiety or the treatment is complex or lengthy, we may use laughing gas, nitrous oxide or in some cases, sleep dentistry in Brisbane through general anaesthesia.

According to Brisbane Dental Sleep Clinic, young children may do better with laughing gas or sleep dentistry Brisbane because they can’t sit still for long appointments.

The sedation type depends on your child’s age and medical history, how cooperative they are, how long the procedure will take, and any previous dental experiences. We’ll talk through which option suits your child and why.

a child under general anaesthesia for dental treatment

When Tooth Extraction Becomes The Only Option

Most of the time, we try to save your child’s tooth. But sometimes extraction is the better choice. Here’s when we recommend removing the tooth instead of trying to save it:

Severe decay with little tooth left: The cavity has destroyed so much of the tooth that there’s not enough structure remaining to hold a filling or crown. Even if we could remove the infected pulp, the tooth would just crumble or break soon after. Extracting it now prevents ongoing pain and repeated treatment failures.
Infection spread to the bone: When irreversible pulpitis progresses to an abscess, the infection can spread into the jawbone and surrounding tissues. If the bone damage is extensive or if your child develops facial swelling and fever, the tooth often can’t be saved. We extract it to stop the infection from spreading further.
Baby tooth near natural shedding: If the infected baby tooth would normally fall out within the next six to twelve months anyway, extraction makes more sense than spending time and money on a pulpectomy. We check X-rays to see how close the permanent tooth is to erupting. If it’s right there, we pull the baby tooth and let nature take its course.
Multiple treatment failures: Sometimes we attempt a pulpotomy or root canal, but the tooth doesn’t respond. The pain returns. The infection comes back. After a second failed attempt, continuing to retreat the same tooth puts your child through unnecessary procedures with poor odds of success. Extraction ends the cycle.
Cracked or fractured roots: A crack that extends down into the root can’t be repaired. Bacteria seep through the crack no matter what treatment we do. These teeth hurt chronically and get reinfected. Extraction is the only permanent solution.
Non-cooperative child and safety concerns: Very young children or children with severe anxiety sometimes can’t tolerate the multiple appointments required for pulp therapy. If sedation or general anaesthetic isn’t an option due to medical conditions or cost, extracting a baby tooth under local anaesthetic alone might be safer and kinder than forcing complex treatment.
Financial constraints: Root canal treatment and crowns for permanent teeth cost more than extractions. If your family can’t afford the more expensive treatment right now and the tooth is causing significant pain, extraction stops the suffering immediately. We’d rather extract a baby tooth than have your child in pain for months while you save money.

After extracting a baby tooth, we assess whether your child needs a space maintainer—a small appliance that holds the gap open so the permanent tooth has room to come through properly.

Simple Steps To Prevent Pulpitis From Developing

Brush twice daily with fluoride toothpaste: Your child needs to brush in the morning and before bed. Use the right amount of fluoride toothpaste for your child. Fluoride strengthens the enamel and makes teeth more resistant to decay. Supervise brushing until your child is at least eight—most kids don’t have the coordination to do it properly before then.
Floss between teeth once daily: Cavities often start between teeth where the brush can’t reach. Floss picks or floss sticks work well for younger children who struggle with regular dental floss. Even baby teeth need flossing once they touch each other. This step matters more than most parents realise.
Limit sugar frequency, not just amount: A biscuit eaten in five minutes does less damage than a juice box sipped over two hours. Bacteria feed on sugar and produce acid that dissolves enamel. Constant snacking or drinking sweet beverages throughout the day means constant acid attack. Offer water between meals instead of juice.
Drink tap water: Most Australian water supplies contain fluoride, which reduces decay by 25 per cent. Skip the bottled water for everyday drinking. If you live in an area without fluoridated water, ask your dentist about fluoride supplements or varnish applications.
Bring your child for check-ups every six months: We catch cavities when they’re small. A tiny filling now prevents a more involved procedure later. Early decay often causes reversible pulpitis that responds well to simple treatment. If left untreated, the condition may become more serious, requiring other dental procedures like root canals or extractions.
Treat cavities as soon as they’re diagnosed: Don’t postpone treatment, hoping the cavity will stay small. It won’t. Decay may progress faster in children than in adults because their enamel is thinner. A cavity that looks minor today can reach the pulp in months. Book the filling appointment as soon as you notice a hole in your child’s tooth.
Protect teeth during sport: Mouthguards prevent knocked-out or fractured teeth. Trauma damages the pulp even when the tooth looks intact from the outside. Custom-fitted mouthguards from your dentist work better than boil-and-bite ones from the chemist, but any mouthguard is better than none.
Address teeth grinding: Some children grind their teeth at night, wearing down the enamel and creating cracks that let bacteria in. If you hear grinding or notice flat, worn edges on your child’s teeth, mention it at the next dental visit. A nightguard might be needed.
Avoid using bottles at bedtime: Milk, formula, or juice in a bottle that your child sips while falling asleep bathes the teeth in sugar all night. This causes severe decay, particularly in the upper front teeth. Water is the only safe bedtime drink in a bottle. Try moving to a cup by your child’s first birthday.

What Happens If Pulpitis Goes Untreated?

Untreated pulpitis doesn’t get better—it gets worse. The infection spreads from the pulp into the root and then into the bone around the tooth. Your child develops an abscess, which is a pocket of pus that causes severe throbbing pain, facial swelling, and sometimes fever. The infection can spread to other teeth, the jaw, or in rare cases, more serious areas like the sinuses or bloodstream. The tooth eventually dies, turns dark, and may develop a pimple-like bump on the gum that drains pus. Even if the pain stops because the nerve has died, the infection is still there and continues damaging the bone. Baby teeth with untreated abscesses can damage the permanent teeth developing underneath. Ultimately, the tooth will need extraction, often under more difficult circumstances than if it had been treated early.

Special Care For Children With Additional Needs

Some children may be bothered more by bright clinic lights, unfamiliar sounds in the dental setting, or the sensation of instruments in their mouth. Our kids’ dentists for special needs adapt the environment and pace. We arrange longer appointments so there’s no rush, and your child can feel comfortable. Your child may see the same dentist each time to build familiarity, and you stay in the room throughout. Our dentists try to show and explain each tool before using it, and when your child can’t tolerate treatment while awake, they may arrange the procedure under GA.

You can read more here: dr-ellie-nadian.com.au and Dentistry for Children with Disabilities Brisbane

Medical Disclaimer

This article provides general information about reversible and irreversible pulpitis in children and should not replace professional dental advice, diagnosis, or treatment. Every child’s dental situation is unique. Always consult with a qualified paediatric dentist or dental professional for advice specific to your child’s condition. If your child is experiencing severe tooth pain, swelling, fever, or other concerning symptoms, seek immediate dental care. The information presented here is current as of 2026 and is based on available evidence and clinical guidelines. Treatment recommendations may vary based on individual circumstances, and your dentist will tailor their approach to your child’s specific needs.