As a parent, you may occasionally wonder how your sweet child can have such bad breath, but bad breath in kids happens!
As opposed to just ‘morning breath’, chronic bad breath (“halitosis”) can have a variety of causes and occasionally can indicate a true medical problem. The most common reasons for halitosis in children include:
- Poor dental habits: Without routine brushing and flossing, bacteria on the teeth increase, which can cause a filmy layer called plaque. Plaque can lead to cavities and gum inflammation, both of which can cause bad breath.
- Dry mouth: This can result from not drinking enough water, sucking of thumbs or fingers, chronic nasal congestion, or chronic mouth breathing. A dry mouth means saliva is not adequate to wash bacteria and food particles away.
- Infection or disease: Viral or bacterial throat, tonsil, or sinus infections can cause bad breath. The bad breath should improve once the infection resolves. If your child has fruity breath, this is quite unusual and could indicate a serious problem like diabetes, though other signs like excessive thirst and urination would typically be present as well.
- Allergies: Chronic nasal congestion or postnasal drip due to allergies can create bad breath.
- Foreign body: If a bead, piece of tissue, or some other small foreign body is stuck up in the nose, a foul odor and nasal discharge from one side of the nose may develop.
- Large, pitted (having an irregular surface) tonsils: Although shallow pits are normal, they can trap bacteria, nasal secretions, and bits of food, which can become calcified, resulting in a tonsil ‘stone’ or tonsillith. This looks like a small whitish lump and can have a bad odor. It is not, however, pus and does not indicate a throat infection.
- Certain foods: Eating foods with strong odors like garlic, onions, etc. can cause bad breath, but it is usually temporary.

There are multiple things to try if your child is having bad breath. Brushing teeth well (begin when teeth are touching) at least twice a day, flossing, and brushing the tongue is important. Make sure your child is drinking plenty of water throughout the day. Older kids can chew sugar-free gum with Xylitol which increases saliva, decreases bacteria, and lowers plaque buildup which can keep the mouth healthier overall.
If you observe chronic nasal congestion or mouth breathing, talk with your child’s health care provider. If tonsil stones are noted, recall that these are harmless and usually go away on their own. Older kids can try gargling with salt water which may loosen the stone. If your child’s breath has a fruity odor especially if there are signs of diabetes, call your child’s provider right away.
Remember that in most cases bad breath is not serious and can be easily remedied. If your child’s breath is not improved by the above measures, a visit with your child’s healthcare provider and/ or dentist may be in order.
more about The contributor
Dr. Elise Herman

Dr. Herman is passionate about community health outreach, school programs, and child/family health and wellness. She has more than 31 years of experience as a pediatrician in Ellensburg, Washington, the last 3 with KVH Pediatrics. In 2022 Dr. Herman mostly retired from practice and continues to contribute blog posts and remain a visible advocate for kids in the community.