Children's dental guide
5 min readTooth decay in children
Tooth decay in children can start with subtle changes. A dentist needs to assess marks, holes, pain or swelling and advise on prevention.
Tooth decay is common and can affect baby teeth as well as adult teeth. It is not a reason to shame children or parents.
Early signs can be difficult to judge at home. A dentist can assess whether marks, holes, pain or sensitivity are decay or another problem.
At a glance
Look for changes
Possible signs
- White, brown or black marks can need dental assessment.
- Pain, sensitivity or food packing can suggest a tooth problem.
- Baby teeth still matter for eating, speech and holding space.
Prevent where possible
Daily routine
- Use fluoride toothpaste and supervised brushing.
- Reduce frequent sugar exposure where possible.
- Ask a dentist about individual prevention advice.
Escalate symptoms
Pain or swelling
- Toothache, swelling or fever needs prompt advice.
- A dental abscess or facial swelling can need urgent dental care.
- Use emergency care for breathing difficulty or severe spreading swelling.
Contents
Decay can look different in children
Decay may appear as marks, holes, sensitivity, pain or a broken area, but parents and carers cannot reliably diagnose it from appearance alone. Dental assessment helps decide what is happening.
Possible causes or contributing factors
- Frequent sugar exposure and plaque left on teeth.
- Insufficient fluoride exposure or brushing difficulty.
- Individual risk factors, tooth shape, medical factors or previous decay.
What you can do now
- Keep brushing with fluoride toothpaste unless advised otherwise.
- Arrange a dental check for marks, holes, pain or sensitivity.
- Offer reassurance and avoid blaming language.
What not to do
- Do not ignore pain because the tooth is a baby tooth.
- Do not put aspirin or medicines against the gum or tooth.
- Do not delay urgent help if swelling or fever develops.
When to contact a dentist
- You see white, brown or black marks, holes or broken enamel.
- A child reports toothache, sensitivity or pain when eating.
- Food keeps catching around a tooth.
When urgent dental care is needed
- Pain is severe, worsening or affecting sleep or eating.
- There is swelling, fever, bad taste or difficulty opening the mouth.
- A child has facial swelling or seems unwell.
What a dentist or relevant professional may assess or do
- Assess teeth and gums and may use X-rays where appropriate.
- Discuss prevention, fluoride and diet advice.
- Explain treatment or monitoring options based on the child's situation.
Frequently asked questions
Does a mark on a tooth mean decay?
Not necessarily. Marks can have different causes. A dentist can assess whether decay is present.
Do baby teeth need dental care?
Yes. Baby teeth help with eating, speech and space for adult teeth, and toothache or infection can affect wellbeing.
When is tooth decay urgent?
Urgent dental care is needed if there is severe pain, swelling, fever, a bad taste, facial swelling or difficulty opening the mouth.
Need urgent help for a child?
If a child has severe dental pain, swelling or urgent symptoms, review urgent dental care options and seek appropriate help.
View urgent dental care optionsOfficial sources
These links open external official guidance pages for further help.
Content reviewed by Dr Majid Saeed · 13 July 2026
References used for this guide are listed above.
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