When a child's toothache suddenly stops, many parents assume the problem has passed. With a dental abscess, the opposite can be true: pain often eases once pus finds a way out through the gum, while the infection inside the tooth carries on. An abscess in a child, even in a baby tooth, needs to be treated by a dentist, and some signs mean that should happen the same day.
Signs that mean same-day care
Call a dentist that day, or go to a hospital emergency department if you cannot get a dental appointment, if your child has:
- swelling of the face, cheek or jaw
- a temperature or seems generally unwell, tired or off their food
- swelling that is closing an eye or spreading under the jaw or tongue
- difficulty swallowing, opening the mouth or breathing
These suggest the infection is spreading beyond the tooth. Trouble breathing or swallowing needs emergency care straight away: call triple zero (000) or go to an emergency department. A small gum bump on a baby tooth, with no facial swelling and a child who is otherwise well, is less urgent but should still be seen within a few days.
How an abscess starts in a child's tooth
Inside every tooth is the pulp, a soft core of nerve and blood vessels. If decay eats through the enamel and dentine, bacteria reach the pulp and it becomes infected and dies. The infection then spreads out through the root tip into the bone, where the body walls it off with pus. Baby teeth have thinner enamel and relatively large pulps, so decay can reach the centre faster than in adult teeth.
The other common route is injury. A fall that knocks a front tooth can cut off its blood supply, and an abscess may appear weeks or months later, sometimes with the tooth turning grey first. Our article on how cavities form and how to prevent them covers the decay side in more detail.
What you might notice at home
The most recognisable sign is a small bump like a pimple on the gum beside a tooth, sometimes called a gum boil. It may come and go, and may leak a salty or bad-tasting fluid when pressed. Other signs include:
- toothache, often worse at night or when chewing
- a tooth that is tender to touch or slightly loose
- swollen, red gum around one tooth
- bad breath or a bad taste that does not go away with brushing
- a tooth that has darkened
Young children may not say their tooth hurts. Instead they may avoid chewing on one side, refuse food, or wake at night.
Why antibiotics alone do not fix it
Antibiotics travel in the bloodstream. An abscess forms where the blood supply has been lost, inside a dead pulp and a walled-off pocket of pus, so medicine cannot reach the source well. A course of antibiotics may calm swelling for a while, but the infection usually returns unless the tooth itself is treated.
For that reason, antibiotics in children are generally reserved for infection that is spreading, with facial swelling or fever, and are given alongside dental treatment rather than instead of it. A localised gum boil in a well child usually does not need them.
Treating the tooth
The aim is to remove the source of infection. Which option suits depends on the tooth, how much of it remains, how close it is to falling out and how your child copes.
Cleaning out the tooth. For a baby tooth that is worth keeping, a pulpectomy removes the infected pulp from the crown and roots, then fills the canals with a material that dissolves as the tooth is naturally lost. The tooth is usually then covered with a crown, often a stainless steel crown on a back tooth.
Removing the tooth. If the tooth is badly broken down, the infection is extensive, or the tooth is due to come out soon anyway, taking it out is often the most reliable answer. Your dentist will discuss whether a space maintainer is needed to keep the gap open for the adult tooth.
Adult teeth. An abscess on a permanent tooth is usually treated with root canal treatment, aiming to keep the tooth long term.
If swelling is significant, the dentist may also drain the pus to relieve pressure. For a child who is very anxious or needs a lot done, ask us about sedation options.
A baby tooth abscess still matters
The adult tooth develops in the bone just beneath the roots of the baby tooth. An infection sitting there for months can disturb the enamel of the adult tooth as it forms, leaving a white, yellow or brown patch, and in some cases affect when or where it comes through. An untreated abscess can also flare and spread into the face. Treating it promptly protects your child's comfort now and the adult tooth to come.
Easing discomfort before the appointment
Children's paracetamol or ibuprofen, given at the dose on the pack for your child's age and weight, can help. A cold pack wrapped in a cloth, held on the outside of the cheek, may ease swelling. Do not give aspirin to children, and never place any tablet against the gum, as it can burn the tissue. Soft, lukewarm foods are easier to manage. Keep the appointment even if the pain settles.
Stopping the next one
Because most childhood abscesses start as cavities, prevention follows the same pattern: brushing twice a day with a fluoride toothpaste suited to your child's age, keeping sweet food and drinks to mealtimes, and regular checks with a dentist or OHT so small holes are fixed while they are small. Healthy gums help too, as our article on gingivitis in children explains. Starting visits early, as described in our guide to the first dental visit, makes these habits easier, and if a small cavity is found, our article on a child's first filling explains what is involved.
Common questions
Will the abscess go away by itself?
No. It may drain and feel better for a time, but the infected tooth remains and the abscess usually returns or spreads.
Can my child go to school with a tooth abscess?
If they are well, without fever or facial swelling, and comfortable with pain relief, school is usually fine while waiting for an appointment in the next day or two. A child with swelling or fever should stay home and be seen that day.
Will my child need a needle?
Most treatment for an abscessed tooth uses local anaesthetic, with numbing gel first so the injection is more comfortable. Your dentist will explain the plan and options before starting.
An abscess is uncomfortable but very treatable when it is dealt with at the source. Our dentists see children at Lumi Dental in Melrose Park, and eligible children may be covered by the Child Dental Benefits Schedule. To book, see our current offers or make a general appointment.
