Bad Breath in Children: Common Causes and What Parents Can Do

By New Dental Center, Al Ain, UAE · Pediatric Dentistry

Bad breath in children is common and usually has a simple cause. Most cases improve with better brushing and hydration. However, persistent bad breath can sometimes signal dental or medical problems that need attention.

Poor Brushing

Plaque and food left on teeth and the tongue are the most common causes. Supervise brushing and help children clean all surfaces.

Tongue Coating

Bacteria on the tongue can cause odour. Teach children to brush their tongue gently.

Mouth Breathing

Children who breathe through their mouth, often due to blocked noses or enlarged tonsils, may have dry mouths and bad breath.

Tooth Decay

Cavities can trap food and bacteria. Regular check-ups help detect decay early.

Diet

Strong-smelling foods and sugary snacks can contribute to bad breath.

Illness

Colds, sinus infections and tonsil problems can cause bad breath.

When to See a Dentist or Doctor

If bad breath persists despite good oral hygiene, see a dentist. If there are signs of illness, see a doctor.

Bad Breath in the Morning

Many children have stronger breath in the morning because saliva flow drops during sleep, allowing bacteria to multiply. This is usually normal and improves after brushing and breakfast. Brushing thoroughly before bed, including gently cleaning the tongue, and making sure children do not eat or drink anything other than water after brushing can reduce morning breath. If morning breath is very strong and persistent, consider whether your child is breathing through their mouth at night.

Foreign Objects in the Nose

In young children, persistent bad breath, especially if accompanied by a smelly discharge from one nostril, can occasionally be caused by a small object stuck in the nose. Children sometimes put beads, food or small toy parts in their noses without telling anyone. If you notice these signs, see your doctor promptly.

Building Good Habits

Make brushing a positive part of your child's routine by brushing together, using a timer or song and letting them choose their toothbrush. Supervise brushing until around age seven or eight to make sure all surfaces are cleaned. Offer water instead of juice, limit sugary snacks and encourage regular meals. These habits help prevent both bad breath and tooth decay.

Dry Mouth and Medication

Some medications, including certain allergy medicines, can reduce saliva and contribute to bad breath. If your child takes regular medication, ask your doctor or pharmacist whether it could affect their mouth, and make sure they drink plenty of water. Sugar-free medicines are better for teeth when available.

Teenagers and Bad Breath

Teenagers may develop bad breath from irregular brushing, braces, energy drinks, late nights or skipping meals. Encourage good habits, regular check-ups and plenty of water. Persistent bad breath may indicate gum inflammation, which is common in teenagers, and should be assessed by a dentist.

When Bad Breath Is a Sign of Illness

Occasionally, unusual breath odours can be linked to medical conditions, such as a fruity smell in poorly controlled diabetes. If your child has unusual breath along with symptoms such as excessive thirst, frequent urination, tiredness or weight loss, see a doctor promptly.

Frequently Asked Questions