Mouth ulcers are small, painful sores that can appear inside a child’s mouth. They may develop on the inner cheeks, lips, tongue, gums, or other soft areas of the mouth. Even a small ulcer can make eating, drinking, brushing, or talking uncomfortable.
Mouth ulcers are common in children and often heal on their own within one to two weeks. However, repeated or long-lasting ulcers may need further evaluation.
What Does a Mouth Ulcer Look Like?
A typical mouth ulcer is usually small, round, or oval. It may have a white or yellowish centre with a red area around it. The sore can be painful, especially when food touches it.
Some children may develop one ulcer, while others may have several at the same time. Their size, number, and location can vary.
Why Do Children Get Mouth Ulcers?
There is no single reason behind every mouth ulcer. Some common causes include:
1. Small Injuries
Children may accidentally bite the inside of their cheek, lip, or tongue while eating. A hard toothbrush, rough food, or a sharp tooth may also irritate the mouth and lead to an ulcer.
2. Certain Foods
Spicy, salty, acidic, or very hot foods may irritate the mouth. Foods such as citrus fruits may also make an existing ulcer more painful.
3. Viral Infections
Some viral infections can cause several sores inside the mouth. Hand, foot, and mouth disease is one example. It may also cause fever and small spots or blisters on the hands and feet.
Other viral infections may cause multiple painful mouth sores along with symptoms such as fever or swollen gums.
4. Nutritional Deficiencies
Repeated mouth ulcers may sometimes be linked with low levels of nutrients such as iron, folate, or certain B vitamins.
This does not mean every mouth ulcer is caused by a deficiency. A doctor may suggest tests if ulcers keep coming back or occur with other symptoms.
5. Dental Irritation
A sharp tooth, dental filling, or braces may rub against the inside of the mouth. Repeated irritation can cause or prolong an ulcer.
6. Recurrent Canker Sores
Some children develop mouth ulcers repeatedly without a clear cause. These are often called canker sores or recurrent aphthous ulcers.
They may return after weeks or months. The exact reason is not always known.
What Can Parents Do at Home?
Most simple mouth ulcers improve without specific treatment. The main aim is to keep the child comfortable while the sore heals.
Offer Plenty of Fluids
Mouth pain may make a child reluctant to drink. Offer frequent sips of water or other suitable fluids.
Keeping the child hydrated is especially important when there are several painful sores.
Choose Soft Foods
Soft foods may be easier to eat when chewing is painful. Cool foods and drinks may also provide some comfort.
Avoid foods that are spicy, salty, acidic, or hard, as they may irritate the sore.
Encourage Gentle Brushing
Good oral hygiene should continue during an ulcer. Use a soft toothbrush and encourage gentle brushing.
Avoid brushing directly over the painful area.
Discourage Picking
Children may touch or pick at the ulcer because it feels unusual. Encourage them to leave it alone, as repeated irritation may increase discomfort.
Are Mouth Ulcers Contagious?
Not all mouth ulcers are contagious.
Simple canker sores do not spread from one child to another. However, mouth sores caused by some viral infections can be contagious.
If mouth ulcers appear along with fever, a skin rash, or several other symptoms, the child may need medical evaluation.
When Should a Child See a Doctor?
A small ulcer that heals within a week or two is usually not a cause for concern.
Medical advice is recommended if:
- The ulcers last longer than two weeks.
- Several ulcers appear at the same time.
- The child has difficulty drinking.
- There are signs of dehydration.
- Mouth ulcers occur with fever or swollen gums.
- There are sores on the lips or a rash on the hands and feet.
- The ulcers keep coming back.
- The child seems unusually unwell.
- A sore repeatedly appears in the same place.
Repeated ulcers may need a closer look at the child’s diet, dental health, medicines, or other symptoms.
Can Mouth Ulcers Be Prevented?
Not every mouth ulcer can be prevented, especially when the cause is unknown. However, a few simple habits may help reduce mouth irritation.
Encourage children to:
- Brush gently with a soft toothbrush.
- Avoid biting their cheeks or lips.
- Eat a varied and balanced diet.
- Drink enough fluids.
- Avoid foods that repeatedly worsen their ulcers.
- Have regular dental check-ups.
- Tell an adult if a tooth, brace, or filling is causing irritation.
What Parents Should Know
Mouth ulcers are common during childhood and are usually temporary. Minor injuries, food irritation, canker sores, and some infections may cause them.
Most simple ulcers heal within one to two weeks. During this time, offer plenty of fluids and soft foods while maintaining gentle oral hygiene.
If ulcers are frequent, severe, unusually long-lasting, or accompanied by other symptoms, a pediatrician or dentist can help identify the cause and suggest suitable care.