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Mouth ulcers - in children

Mouth ulcers - in children

07 Nov 2019

Mouth ulcers - in children

As the mouth is one of the most sensitive parts of the body, when children get mouth ulcers, the pain and discomfort can be very irritating.


There are lots of things that can cause mouth ulcers in children, but they usually occur due to damaging their mouth, for example when they accidentally bite the inside of their cheek, chew something rough which can cut their mouth, or catch their cheek or lip on a sharp tooth or filling. They can also develop because they are feeling tired, generally unwell or run down, or because they are wearing braces.

It could be that some children often have mouth ulcers because it runs in their family. Their diet can play a part too, and there are certain foods that may cause mouth ulcers, including:

  1. Spicy foods
  2. Salty foods
  3. Toast
  4. Crisps
  5. Fruit juice

Sometimes, mouth ulcers keep coming back due to a lack of vitamin B12 or iron, or a medical condition such as Coeliac or Crohn’s disease. 


A mouth ulcer is:

  • Painful
  • Round or oval in shape
  • Usually red or yellow in colour
  • Swollen around the edge

Most mouth ulcers appear on the:

  • Inside of the lips
  • Inside of the cheeks
  • Floor of the mouth
  • Under the surface of the tongue

It's rare to get a mouth ulcer on the roof of your mouth.


Most mouth ulcers don’t need any treatment and will heal on their own if they’re not interfering with your child’s daily activities. If they’re painful, however, a local pharmacy will have suitable medicines without a prescription. Make sure the medicine is suitable for your child's age.


The main goal for treating your child’s mouth ulcer is to relieve their pain and discomfort. There is a product in the bonjela range, suitable for children over 5 months, as well as adults and the elderly.

Bonjela Junior Gel– sugar free, clear, almost colourless banana-flavoured gel for the relief of pain and discomfort from common mouth ulcers.

Medicine for children over 5 months, adults and the elderly. Not for use in teething infants. Always read the label.

Top Tips

  1. Make sure that your child cleans their teeth properly and take them to visit the dentist regularly
  2. Supervise your child brushing their teeth until the age of 7 or 8, or when they are able to brush them properly on their own.
Healthy mouth tips

Find out with mouth care experts Bonjela, how to maintain the health of your mouth and gums.

Oral Health Advice

Find general advice on how to care for your mouth, helping to ensure it stays healthy and happy.


Once your braces are fitted food can easily get stuck. Find out with mouth care experts Bonjela, about how to take excellent care of your mouth.