Bad breath: causes and fixes
Everyone has bad breath now and then, especially first thing in the morning. Breath that stays bad through the day usually has a cause in the mouth, and most causes can be fixed. Here is what is going on, and what actually helps.
Where bad breath starts
Most bad breath starts in the mouth. Bacteria live on your teeth, your gums, and especially the back of your tongue. As they break down food particles and shed cells, they release sulfur gases, and those gases are what you smell. Anything that lets those bacteria build up, or dries the mouth out, makes breath worse.
Common causes
- Bacteria coating on the tongue. The most common source of all.
- Gum disease. Bacteria collect below the gumline, and bad breath can be one of its early signs.
- Dry mouth. Saliva rinses the mouth and holds bacteria in check. Many medications reduce it, and so does sleeping with your mouth open.
- Food. Garlic, onions, coffee, and alcohol are the usual suspects. Their effect is temporary.
- Tobacco. It smells on its own, and it also dries the mouth and feeds gum disease.
- Dental problems. Decay, an abscess, or a poorly fitting denture can hold bacteria. See also our cavities and tooth decay topic.
- Morning breath. Saliva slows overnight, so bacteria get a head start. This one is normal, and clears with breakfast and brushing.
Causes beyond the mouth
Less often, persistent bad breath comes from outside the mouth: sinus and throat conditions, acid reflux, or certain medical conditions. If your mouth is healthy and well cared for and the problem continues, that is worth raising with your dentist or your physician.
What actually helps
- Brush twice a day, and brush or scrape your tongue, gently, as far back as is comfortable.
- Clean between your teeth daily. Bacteria between teeth are a major source.
- Stay hydrated, and if dry mouth is an issue, ask about ways to support saliva.
- Keep regular professional cleanings. Hardened deposits, called tartar, cannot be brushed away at home.
- If you use mouthwash, treat it as a short-term cover, not a fix. It masks odor briefly without removing the cause.
When to ask for help
Bad breath that persists in spite of good home care deserves a look. It can be an early sign of gum disease or decay, both of which are easier to treat early. Mention it at your next checkup, or sooner if it comes with bleeding gums, a bad taste that will not leave, or a sore tooth.