Bad breath happens to everyone from time to time, including children. But if your child’s bad breath keeps coming back, even after they clean their teeth, you may start to wonder if something else is going on.

Ping Zhang, a pediatric dentistry expert at UAB Dentistry, explains what can cause bad breath in children, what parents can try at home and when it may be worth talking with a dentist.

What causes bad breath in children?

Many cases of bad breath begin in the mouth. Bacteria can accumulate on the teeth, gums and tongue and produce unpleasant odors. Food left between the teeth, plaque buildup and other oral health concerns can also contribute.

“Bad breath once in a while is common, but when parents notice it regularly, it may be helpful to take a closer look at the child’s daily habits and oral health,” Zhang said. “Sometimes a small change in their routine can make a difference. However, persistent bad breath may signal an underlying dental or medical issue and should be evaluated further.”

Why does my child have bad breath even after brushing?

Brushing helps clean the teeth, but odor-causing bacteria can also build up in areas a toothbrush may not reach, including between the teeth and on the tongue. If a child has severe tooth decay, gum disease or another oral infection, brushing alone may not eliminate the odor. Certain medical conditions, such as sinus infections, enlarged tonsils or acid reflux, can also contribute to bad breath.

This means fresh breath is not necessarily about brushing more often. It may be about cleaning areas that are being missed or addressing an underlying oral or medical condition.

“Parents may see their child brushing every day and assume that all areas of the mouth are adequately cleaned,” Zhang said. “Depending on the child’s age and skill level, they may still need help with cleaning certain areas and flossing as part of their daily oral hygiene routine.”

Can mouth breathing cause bad breath?

Children who breathe through their mouth may experience more dryness in the mouth. Research has found an association between mouth breathing and bad breath in children.

Saliva plays an important role in keeping the mouth clean. When the mouth becomes dry, bacteria and debris are not cleared away as easily.

“If a parent regularly notices mouth breathing along with bad breath, especially when the symptoms persist, it is worth bringing to the attention of the child’s dentist,” Zhang said. “It gives us another piece of information as we consider potential factors contributing to the problem.”

Is morning breath normal for kids?

Morning breath is common. Saliva production decreases during sleep, giving odor-producing bacteria more opportunity to build up overnight.

If the odor improves after your child gets up and cleans their mouth, it may simply be morning breath. Bad breath that continues throughout the day or repeatedly returns deserves more attention.

How can I help my child with bad breath?

Instead of simply reaching for a mint, focus on where the odor may be coming from.

Clean the tongue. Bacteria can accumulate on its surface, so gently cleaning it can be an important part of the routine.

Check the spaces between teeth. Food and plaque can remain where a toothbrush cannot reach. Flossing helps clean those areas.

Look for a pattern. Notice when the bad breath occurs and whether it improves after cleaning the mouth. This information can be useful if you need to discuss it with your child’s dentist.

When should I talk to my child’s dentist?

If bad breath continues despite good oral hygiene, bring it up with your child’s dentist. A dental examination can help determine whether something in the mouth may be contributing and whether additional evaluation is needed.

“Persistent bad breath is something parents should feel comfortable discussing with their child’s dentist,” Zhang said. “Finding out why it is happening is more helpful than simply trying to cover up the odor. Establishing a dental home by a child’s first birthday and maintaining regular dental visits can help detect and address oral health concerns early, including issues that may contribute to bad breath.”

More Patient Education

Healthy Teeth for Kids: Oral Health Tips by Age

Why Age 7? UAB Dentistry Experts Explain the Importance of Early Orthodontic Visits

Sippy Cups, Snacks, and Cavities: What Parents Need to Know