Main Causes of Toothache in Children: Signs Every Mother Should Know

Find out what might be causing your child’s tooth pain, what you can do to ease the discomfort, and which signs mean it’s time to see a dentist.

By Dr. Camila. Last updated: September 2026

Hi, moms and dads! 💛

Few things worry us as much as hearing our child say, “My tooth hurts.”

And when it happens, several questions usually come up at once: Is it a cavity? Is it just a tooth coming in? Did they bump it? Do I need to rush to the dentist?

As a dentist and a mom, I know how hard it can be to make decisions when your child is in pain.

The good news is you don’t have to figure it all out on your own.

Toothache in children can have several causes, and some need prompt care. In this post, I’ll walk you through the main causes of tooth pain in kids, the warning signs worth paying attention to, and what you can do while you seek professional guidance.

Main Causes of Toothache in Children

Toothache isn’t a condition on its own — it’s a sign that something is going on. The type of pain, its location, and any accompanying symptoms can help the dentist figure out the cause.

Some of the most common causes include:

• tooth decay (cavities);
• inflammation or infection of the tooth;
• trauma;
• teething or tooth eruption/loss;
• gum problems;
• food stuck between the teeth;
• bite- or development-related changes.

Let’s go through each one.

Cavities in Children: One of the Most Common Causes of Tooth Pain

Cavities are one of the leading causes of toothache in children.

They happen when acids produced by bacteria in the mouth gradually damage the tooth. Early on, a cavity may cause no pain at all. As it progresses, though, it can reach deeper layers of the tooth and cause sensitivity or pain.

Your child may complain especially when eating or drinking something:

• very cold;
• very hot;
• sweet;
• or while chewing.

Here’s an important detail: the absence of pain doesn’t mean there’s no cavity.

That’s why waiting for a tooth to start hurting before taking your child to the dentist isn’t a good strategy. Regular checkups and ongoing assessment of cavity risk help catch problems before they progress. The AAPD recommends that cavity risk be assessed individually, with prevention and follow-up tailored to each child’s age and needs.

Signs that may point to a cavity:

Keep an eye out for:

• white, yellowish, brown, or dark spots;
• small holes in the tooth;
• sensitivity to cold or sweets;
• pain while chewing;
• food frequently getting stuck in a specific spot;
• spontaneous pain or pain that becomes more frequent.

If your child is already in pain from a cavity, it’s worth seeing a dentist to determine how deep the problem goes and treat the cause — not just manage the pain at home.

Tooth Injury in Children: Toothache After a Fall or Bump

Kids run, play, jump, ride bikes… and accidents happen.

A blow to the mouth can cause different types of dental trauma, ranging from a small change in the enamel to fractures or tooth displacement.

Here’s something many parents don’t realize: a traumatized tooth can look normal on the outside and still need follow-up care.

After a fall or bump, watch for:

• pain;
• sensitivity to touch or chewing;
• bleeding;
• swelling;
• a chipped or broken tooth;
• a tooth that’s become looser;
• a tooth that’s shifted position;
• a change in the tooth’s color.

In baby teeth, trauma also deserves attention because a permanent tooth is developing near the baby tooth’s roots. Follow-up care depends on the type of trauma and the child’s age.

If there’s been a significant blow to the mouth, it’s best to have your child evaluated by a dentist, even if the pain seems minor.

Teething and Losing Baby Teeth Can Cause Discomfort

Not all mouth pain means something’s wrong.

Babies can experience discomfort as their first teeth come in, and older children may also feel some sensitivity or discomfort while losing baby teeth.

During this phase, you might notice:

• a more sensitive gum area;
• a desire to bite on objects;
• itching or discomfort in the gums;
• a loosening baby tooth;
• localized sensitivity;
• small changes in eating habits due to the discomfort.

But be careful: intense or persistent pain, swelling, or fever shouldn’t automatically be blamed on teething or tooth loss.

When symptoms seem severe or different from usual, it’s important to investigate further.

Dental Abscess in Children: When Pain Needs Prompt Attention

One of the situations that worries parents most is a dental abscess.

It can occur when an infection related to the tooth develops, and it may be linked to a deep cavity or trauma.

Some warning signs include:

• intense pain;
• gum swelling;
• facial swelling;
• pus;
• a bad taste in the mouth;
• fever;
• difficulty chewing;
• a child who seems unusually tired or unwell.

Facial swelling linked to a dental infection calls for prompt dental care.

And if there’s difficulty breathing or swallowing, or swelling that’s noticeably increasing, seek emergency care right away.

The AAPD lists pain, infection, and facial swelling among the situations that may require urgent dental care.

One more important point: antibiotics aren’t an automatic treatment for every toothache. When there’s a dental infection, whether antibiotics are needed depends on a clinical evaluation of the specific case.

Other Situations That Can Cause Pain or Discomfort

The cause isn’t always a cavity or an infection.

Sometimes children feel pain or discomfort because of:

Food stuck between the teeth
A small piece of food wedged between two teeth can press on the gum and cause quite a bit of discomfort. Careful flossing can help remove it. If the pain continues afterward, it’s worth investigating further.

Gum problems
Gums that are very red, swollen, sore, or that bleed frequently also deserve evaluation.

Bite or overload issues
In some cases, bite alignment can contribute to discomfort while chewing. A dentist can assess whether there’s a connection between the pain and how the teeth meet.

How to Ease Your Child’s Tooth Pain at Home

When a child is in pain, our first instinct is to do something right away.

There are measures that can offer temporary relief, but it’s important to remember: easing the pain doesn’t mean treating the cause.

If the pain is related to a deep cavity, an infection, or trauma, your child will still need to be evaluated.

Cold compress
If there’s swelling after a bump or discomfort in the area, a cold compress applied externally to the cheek can help reduce discomfort. Use a cloth barrier between the ice and the skin, and apply it briefly — never place ice directly on the skin. Avoid warm compresses over a swollen area or one with suspected infection.

Pain relievers
Medication can be used to manage pain in children, but the choice and dosage need to match the child’s age, weight, and health conditions. The ADA has specific recommendations for managing acute dental pain in children, including options like ibuprofen and acetaminophen, when appropriate and used as directed. If you’re unsure which medication or dose to give, talk to your pediatrician, dentist, or pharmacist. Never estimate a dose, and never give a child medication meant for adults without proper guidance.

What about warm salt water?
This is a well-known home remedy, but there’s an important catch: rinsing should only be considered for children who can reliably spit it out. Young children may swallow the solution, so it’s not appropriate for every child. It also doesn’t treat a cavity, infection, or abscess.

What Not to Do When Your Child Has a Toothache

When a child is in pain, it’s natural to want to try anything that might help. But some home remedies can actually make things worse.

Avoid:

• putting aspirin directly on the tooth or gum;
• applying alcohol to the tooth;
• applying irritating substances to the gum;
• applying heat directly to a swollen area;
• puncturing or squeezing a pus-filled bump;
• giving antibiotics on your own;
• indefinitely postponing a dental visit just because the pain eased.

Pain easing doesn’t necessarily mean the problem is gone.

When to See a Dentist for Child Tooth Pain

Not every toothache is a hospital emergency, but persistent pain in a child always deserves to be looked into.

See a dentist especially when there’s:

• pain that doesn’t improve;
• pain that wakes the child up at night;
• pain while chewing;
• frequent sensitivity;
• gum swelling;
• a broken tooth;
• recent trauma;
• pus;
• fever associated with dental symptoms;
• difficulty eating or drinking.

🚨 When to seek urgent care

Seek care immediately if your child shows signs such as:

• significant facial swelling;
• swelling that’s rapidly increasing;
• difficulty breathing;
• difficulty swallowing;
• bleeding that can’t be controlled;
• major facial trauma;
• intense pain combined with signs of infection.

These situations may require urgent evaluation.

How Does a Pediatric Dentist Find the Cause of the Pain?

Here’s an important part: you can’t determine the cause of pain just from how intense it is.

During the visit, the dentist may assess:

• where the child feels pain;
• when the pain occurs;
• sensitivity to cold or chewing;
• presence of cavities;
• gum condition;
• signs of infection;
• changes in the teeth;
• history of trauma;
• stage of dental development and tooth loss.

Depending on the case, imaging exams may also be needed.

Only after this evaluation can the right treatment be determined — and it can vary widely, from preventive guidance or a filling to pulp treatments, trauma follow-up, or, in some cases, extraction.

How to Prevent Toothache in Children

The best way to deal with toothache is to try to prevent it in the first place — and that starts with simple habits.

Brushing with fluoride toothpaste
Brushing should be part of the routine from the moment the first teeth come in, using an age-appropriate amount of toothpaste. For young children, parental involvement is essential. Even once a child wants to brush on their own, they may still need an adult’s help or supervision to ensure proper cleaning.

Flossing
When two teeth touch, a toothbrush can’t fully clean between them — that’s where floss comes in. An adult should help the child until they have enough coordination to do it on their own.

Less sugar, fewer snacks throughout the day
It’s not just the amount of sugar that matters — how often teeth are exposed to sugary foods and drinks also affects cavity risk. It’s worth avoiding the habit of offering small sugary snacks or sweetened drinks multiple times a day.

Dental visits
We don’t need to wait for a child to be in pain to take them to the dentist. Regular checkups make it possible to monitor tooth development, catch problems early, and tailor prevention to each child’s individual cavity risk.

What to Do If Your Child Complains of Tooth Pain at Night

This is a situation that leaves many parents feeling helpless.

If the pain started at night and your child is stable, with no emergency signs, you can offer comfort measures and seek dental guidance as soon as possible. Careful oral hygiene, softer foods, and, when appropriate, a suitable pain reliever can help in the short term.

But if there’s significant swelling, fever, difficulty breathing or swallowing, uncontrolled bleeding, or any other emergency sign, don’t wait until morning to seek care.

Main Causes of Toothache in Children: What Every Parent Should Remember

When your child complains of tooth pain, the most important thing is not to try to guess the cause on your own.

It could be a cavity, trauma, tooth loss, inflammation, an infection, or even something simpler, like food stuck between the teeth. What sets one situation apart from another is proper evaluation.

As a mom, I know our first instinct is to try to fix everything quickly. But when there’s pain, the best path forward is understanding what’s causing it.

And here’s something I always like to remind parents: baby teeth deserve care too. They play a role in eating, speech, and hold space for permanent teeth.

So we don’t need to wait for intense pain to start taking care. With regular checkups, good hygiene habits, and attention to everyday signs, we can prevent many problems and make dental visits much less stressful for our kids. 💛

With care,
Dr. Camila – Mamãe Sorriso ❤️

Frequently Asked Questions About Toothache in Children