Children rarely walk up and announce that a tooth hurts. They mention it once, you ask a follow-up question, they shrug, and the moment passes. By the time discomfort is obvious, the problem is often well established. Knowing the early signs that something isn’t quite right gives you a window to act before a small issue becomes an extraction.
This guide covers the visual signs, behavioural signs, and oral habits that should prompt a dental appointment, along with the timescales that matter. If anything in here feels familiar, please don’t wait, our children’s dentistry team in Westcliff-on-Sea will fit you in promptly.
Visual signs you can spot at home
Once a week, when you’re brushing or supervising brushing, give your child’s mouth a proper look. Phone torch, head tipped back, and check systematically. Look for:
White, chalky patches on the front teeth, particularly along the gumline. These are early demineralisation, the very first stage of decay, and at this point it’s reversible with fluoride and improved technique.- Brown or black spots on the chewing surfaces of the back teeth, in the deep grooves. These are caries that have got past the white-spot stage and need professional attention.
- Holes you can clearly see, even small ones. Once a cavity is visible, it’s gone too far to remineralise.
- Red, swollen, or bleeding gums, especially at the margin where tooth meets gum. Healthy gums in children are pale pink and don’t bleed when brushed.
- A swelling on the gum, particularly above a back tooth, sometimes appearing like a small pimple or a soft lump. This is often a dental abscess and needs urgent attention.
- A tooth that looks darker than its neighbours. After a knock, a tooth can darken from internal bleeding and may need monitoring or treatment.
- Chipped or worn-looking edges on the front teeth in a child who grinds.
Behavioural signs that something is wrong
Children, particularly under fives, communicate dental pain through behaviour rather than words. Watch for:
- Avoiding chewing on one side of the mouth, or favouring soft foods.
- Reluctance to drink cold drinks, or wincing at ice cream.
- Touching or rubbing one cheek or one side of the jaw.
- Disturbed sleep, particularly waking in the early hours crying without obvious reason.
- Bad breath that doesn’t shift with brushing, especially with a sweetish or sour edge.
- Refusing to brush a particular area, or pulling away when you brush it.
- Going off food in general, or drinking far less than usual.
That said, none of these on their own is a diagnosis. A child can refuse a meal because they’re tired or coming down with something. The pattern matters more than any single observation. If a behaviour persists for three days or appears alongside one of the visual signs above, book an appointment.
Sign-by-sign timescales: when to act
| Sign | How urgent | What it usually is |
|---|---|---|
| White chalky patches near the gumline | Within 4 to 6 weeks | Early demineralisation, reversible |
| Brown or black spots on molars | Within 2 to 4 weeks | Established decay, needs filling or sealant |
| Visible cavity (a hole) | Within 1 to 2 weeks | Cavity that needs restoring |
| Bleeding gums on brushing | Within 2 to 4 weeks | Plaque-related gingivitis, fixable with technique |
| Gum swelling or a ‘pimple’ on the gum | Same day or next working day | Likely abscess, can spread, urgent |
| Severe ongoing toothache | Same day | Pulpitis or abscess |
| Knocked-out adult tooth | Within the hour | Re-implantation possible if quick |
| Knocked-out baby tooth | Same day | Don’t reimplant, but get reviewed |
Tooth knocks and trauma
Children fall over and bump teeth regularly. Most knocks are minor and the tooth settles within a week or two. The ones that need urgent care are:
Adult teeth that have been completely knocked out. The single most useful thing you can do is pop the tooth back into the socket and hold it there until you get to a dentist. If that isn’t possible, store it in milk (not water) and get to an emergency dental service within an hour. The British Society of Paediatric Dentistry has clear guidance on dental trauma at bspd.co.uk and most hospital A&E departments will direct you to the right place.
Adult teeth that have been pushed in or out of position. Don’t touch, get to a dentist same-day.
Any tooth that has cracked into the gum, or where there’s significant bleeding from the gum. Same-day review.
Baby teeth that have been knocked out should NOT be reimplanted, because that can damage the developing adult tooth above. But the child should still be checked, because the trauma may have affected the underlying adult tooth.
Habit-related signs to mention to your dentist
Some habits don’t cause immediate pain but reshape teeth over time, and these are worth mentioning at routine visits.
Persistent thumb sucking past age four can push the upper front teeth forwards and create an open bite. Most children stop on their own; if your child is still going at school age, that’s the point to chat about it.
Mouth breathing during sleep, often accompanied by snoring, can affect both jaw development and dental health. Worth mentioning, particularly if there’s chronic congestion or enlarged tonsils.
Tooth grinding (bruxism) is common in children and usually settles. If it’s loud, frequent, and producing visible wear, it’s worth a review.
Lip biting or nail biting that’s wearing the front teeth.
What a dental visit involves when there’s a concern
If you bring a child in worried about a sign you’ve spotted, a routine examination usually answers the question within ten minutes. We look at the tooth in question, check for decay, take a small X-ray if needed (the radiation dose is tiny, less than a long-haul flight), and explain what we see. If it’s nothing, we say so and you can stop worrying.
In our experience, the children with the best long-term dental health are the ones whose parents pay attention without being anxious. You don’t need to inspect every tooth every night. You just need to know roughly what their mouth normally looks like, and to come in when something seems off.
Worth knowing: NHS dental check-ups and treatment are free for under-18s in England, so cost should never be the reason to delay.
The other thing worth saying is that dental pain in children behaves differently from adult dental pain. Adults with toothache typically have a clear, localised, throbbing ache in a specific tooth. Children, particularly under sevens, often have referred pain, where a problem in an upper molar is felt in the ear or jaw, or in a lower molar felt in the cheek. They may struggle to point at the tooth at all. So when a child says “my ear hurts” but you’ve checked with the GP and the ear is fine, a dental cause is worth considering. The same applies to children who go off food without obvious reason.
Bad breath in a child that doesn’t shift after a thorough brush deserves a mention too. The usual cause is a piece of food trapped between teeth or under the gum margin, but it can also be a sign of an abscess that hasn’t yet caused obvious pain. A quick look from a dentist usually settles the question in five minutes.
Finally, on diet. Children with frequent sugar exposure (juice through the day, sweets between meals, sweetened yoghurts as snacks) are at much higher risk of developing the signs in this article in the first place. The single biggest preventive habit is keeping sugar to mealtimes only and water as the between-meal drink. That single change reduces caries risk more than any other intervention you can do at home.
If you’ve spotted something in your child’s mouth and you’re not sure what to do, please ring our team at Westcliff Dental Practice. Bringing them in for a quick look is always better than worrying for weeks. Call 01702 344 500 and we’ll get you booked in.
