Bad breath can come and go, but when it lingers no matter what you do, that’s when it may be time to consider something deeper. The term for chronic bad breath is halitosis, and what it smells like can tell you more than you might expect. These odors aren't all the same, and neither are their causes.
Rotten, Spoiled, or Decomposing
If your breath smells like something has gone bad, it could be a sign of an infection. In many cases, that strong rotting odor comes from bacteria hiding in the gums, especially in cases of untreated gum disease or dental decay.
Infections, especially those producing pus, can give off a potent stench. If food is stuck around crowns, dentures, or braces, the trapped particles can break down and create similar smells.
Sour or Acidic Odor
A sharp, sour breath is usually not related to anything in the mouth. Many people with acid reflux or GERD experience sour-smelling breath. When stomach contents back up into the esophagus, they can carry acid and partially digested food with them. This can linger in the mouth, especially after eating or while sleeping.
If brushing doesn’t help and you also notice heartburn, it’s worth getting this checked.
Musty or Mildew-Like
If this is combined with other symptoms, like fatigue or yellowing skin, it may be time for a full medical evaluation.
When to Get Help
If brushing, flossing, and mouthwash aren’t fixing the problem, it might be time to get help. Chronic halitosis is often a sign of something else. Start with your dentist. If everything looks fine there, your doctor may need to check for other causes.
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Related: Is Bad Breath a Sign of Illness?
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