Tongue bacteria are one of the usual causes of bad breath, the problem National Fresh Breath Day tackles on Friday, August 6, 2027. Most cases are fixable at home.
When to Mark National Fresh Breath Day
August 6 brings it around each year. No dental group or company is on record as its creator.
No Founder, Plenty of Science
Its origin may be a blank, but the science behind it is well understood. The Merck Manual’s consumer guide lays out the main culprits.
Merck traces the usual causes to the mouth. Bacteria break down bits of food into foul-smelling substances, and they thrive in people with gum disease or poor oral hygiene.
The American Dental Association counts hundreds of types of odor-causing bacteria living naturally in the mouth.
Those microbes also grow on the back of the tongue, even when gums are healthy, Merck notes. Low saliva makes things worse, which is why some medicines and diseases bring it on.
Dry mouth has several causes, the ADA lists. Medications and salivary gland problems can trigger it, and so can breathing through the mouth.
Food plays a part. Garlic and onion odors travel through the bloodstream to the lungs, so brushing can’t remove them. Garlic can stay noticeable for 2 to 3 hours.
Less common causes
Sometimes the source lies elsewhere. Merck lists sinus and lung infections, and in children a foreign object stuck in the nose is a classic culprit.
Rarely, a pouch in the esophagus called a Zenker diverticulum traps food. Contrary to a popular belief, though, poor digestion doesn’t cause bad breath, Merck notes.
Some smells signal other illness, according to Merck. Kidney failure can make breath smell like ammonia, and uncontrolled diabetes like nail polish remover. Liver failure can give it a mousy, sometimes rotten-egg smell.
How doctors check
A dentist or doctor may use a simple sniff test, with the patient breathing out about 4 inches away. A worse smell from the mouth points to a mouth source, and a worse one from the nose suggests the sinuses.
If the source is still unclear, the examiner may scrape the back of the tongue with a plastic spoon and sniff it. Gadgets like portable sulfur monitors exist, Merck says, but they’re rarely needed outside research.
Why Fresh Breath Is Worth a Day
Breath can flag gum trouble early. Persistent bad breath or a constant bad taste can be “a warning sign of advanced gum disease,” according to the ADA.
Smokers may not even notice the problem. Smoking dulls the sense of smell, the ADA adds.
Few cases are urgent, Merck notes. Bad breath rarely needs immediate evaluation, but fever or pus-filled mucus means seeing a doctor right away.
Fresh-Breath Habits Backed by Dentists
- Brush twice a day: and clean between your teeth with floss once daily, as the ADA advises.
- Clean your tongue: scrub the top and back with a toothbrush or tongue scraper.
- Get saliva flowing: chew sugar-free gum or crunchy foods like carrots and apples.
- Know mouthwash’s limits: rinses with chlorhexidine, cetylpyridinium chloride or zinc may help, but the effect usually fades in under 20 minutes.
- Clean dentures overnight: take them out at night and wash them well before wearing them again.
- Book a cleaning: see a dentist if the odor won’t quit.
Frequently Asked Questions
Can bad breath be imagined?
Yes. Some people sense an odor others can’t detect, a condition called psychogenic halitosis.
Do older adults have worse breath?
Not because of age alone. They’re more likely to take medicines that dry the mouth, and oral cancers grow more common later in life.
How long should I avoid strong foods before a breath test?
About 48 hours, Merck advises.
Can I buy chlorhexidine rinse at the store?
No. Those rinses aren’t sold over the counter.