Mayo Clinic Health Library

Bad breath

Updated: 12-18-2012

Definition

Bad breath, also called halitosis, can be embarrassing and in some cases may even cause anxiety. It's no wonder that store shelves are overflowing with gum, mints, mouthwashes and other products designed to fight bad breath. But many of these products are only temporary measures because they don't address the cause of the problem.

Certain foods, health conditions and habits are among the causes of bad breath. In many cases, you can improve bad breath with consistent proper dental hygiene. If simple self-care techniques don't solve the problem, see your dentist or physician to be sure a more serious condition isn't causing your bad breath.

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Symptoms

Bad breath odors vary, depending on the source or the underlying cause. Some people worry too much about their breath even though they have little or no mouth odor, while others have bad breath and don't know it. Because it's difficult to assess how your own breath smells, ask a close friend or relative to confirm your bad-breath questions.

When to see a doctor
If you have bad breath, review your oral hygiene habits. Try making lifestyle changes, such as brushing your teeth and tongue after eating, using dental floss, and drinking plenty of water.

If your bad breath persists after making such changes, see your dentist. If your dentist suspects a more serious condition is causing your bad breath, he or she may refer you to a physician to find the cause of the odor.

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Causes

Most bad breath starts in your mouth, and there are many possible causes. They include:

  • Food. The breakdown of food particles in and around your teeth can increase bacteria and cause a foul odor. Eating certain foods, such as onions, garlic, and other vegetables and spices, also can cause bad breath. After you digest these foods, they enter your bloodstream, are carried to your lungs and affect your breath.
  • Tobacco products. Smoking causes its own unpleasant mouth odor. Smokers and oral tobacco users are also more likely to have gum disease, another source of bad breath.
  • Poor dental hygiene. If you don't brush and floss daily, food particles remain in your mouth, causing bad breath. A colorless, sticky film of bacteria (plaque) forms on your teeth and if not brushed away, plaque can irritate your gums (gingivitis) and eventually form plaque-filled pockets between your teeth and gums (periodontitis). The uneven surface of the tongue also can trap bacteria that produce odors. And dentures that aren't cleaned regularly or don't fit properly can harbor odor-causing bacteria and food particles.
  • Dry mouth. Saliva helps cleanse your mouth, removing particles that may cause bad odors. A condition called dry mouth — also known as xerostomia (zeer-o-STOE-me-ah) — can contribute to bad breath because production of saliva is decreased. Dry mouth naturally occurs during sleep, leading to "morning breath," and is made worse if you sleep with your mouth open. Some medications can lead to a chronic dry mouth, as can a problem with your salivary glands and some diseases.
  • Infections in your mouth. Bad breath can be caused by surgical wounds after oral surgery, such as tooth removal, or as a result of tooth decay, gum disease or mouth sores.
  • Other mouth, nose and throat conditions. Bad breath can occasionally stem from small stones that form in the tonsils and are covered with bacteria that produce odorous chemicals. Infections or chronic inflammation in the nose, sinuses or throat, which can contribute to postnasal drip, also can cause bad breath.
  • Medications. Some medications can indirectly produce bad breath by contributing to dry mouth. Others can be broken down in the body to release chemicals that can be carried on your breath.
  • Other causes. Diseases, such as some cancers, and conditions such as metabolic disorders, can cause a distinctive breath odor as a result of chemicals they produce. Chronic reflux of stomach acids (gastroesophageal reflux disease) can be associated with bad breath. Bad breath in young children may be caused by a foreign body, such as a small toy or piece of food, lodged in a nostril.
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Preparing for your appointment

If you're going to have your bad breath evaluated by your dentist, the following tips will help:

  • Dentists generally prefer morning appointments for testing bad breath to reduce the chances that foods you eat during the day will hinder the exam.
  • Don't eat, drink, chew gum or smoke for three hours before your appointment.
  • Don't wear perfume, scented lotions, or scented lipstick or lip gloss to your appointment, as these products could mask any odors.
  • If you've taken antibiotics within the last month, check with your dentist to see if your appointment needs to be rescheduled.

What to expect from your dentist
Your dentist will likely start with an evaluation of your medical history, asking questions such as:

  • When did you first begin to experience bad breath?
  • Is your bad breath occasional or continuous?
  • How often do you brush your teeth or clean your dentures?
  • How often do you floss?
  • What kinds of foods do you eat?
  • What medications and supplements do you take?
  • What health conditions do you have?
  • Do you breathe through your mouth?
  • Do you snore?
  • Do you have allergies or sinus problems?
  • What do you suspect might be causing your bad breath?
  • Have other people noticed and commented on your bad breath?
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Tests and diagnosis

Your dentist will likely smell both the breath from your mouth and the breath from your nose and rate the odor on a scale. Because the back of the tongue is most often the source of the smell, your dentist may also scrape it and rate its odor.

There are sophisticated detectors that can identify the chemicals responsible for bad breath, but these aren't always available.

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Treatments and drugs

To reduce bad breath, help avoid cavities and lower your risk of gum disease, consistently practice good oral hygiene. Further treatment for bad breath can vary, depending on the cause. If your bad breath is thought to be caused by an underlying health condition, your dentist will likely refer you to your primary care physician.

For causes related to oral health, your dentist will work with you to help you better control that condition. Dental measures may include:

  • Mouth rinses and toothpastes. If your bad breath is due to a buildup of bacteria (plaque) on your teeth, your dentist may recommend a mouth rinse that kills the bacteria. Mouth rinses containing cetylpyridinium chloride and those with chlorhexidine can prevent production of odors that cause bad breath. Your dentist may also recommend a toothpaste that contains an antibacterial agent to kill the bacteria that cause plaque buildup.
  • Treatment of dental disease. If your dentist discovers that you have gum disease, you may be referred to a gum specialist (periodontist). Gum disease can cause the gums to pull away from the teeth, leaving deep pockets that accumulate odor-causing bacteria. Sometimes these bacteria can be removed only by professional cleaning. Your dentist might also recommend replacing faulty tooth restorations, which can be a breeding ground for bacteria.
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Lifestyle and home remedies

To reduce or prevent bad breath:

  • Brush your teeth after you eat. Keep a toothbrush at work to use after eating. Brush using a fluoride-containing toothpaste at least twice a day, especially after meals. Toothpaste with antibacterial properties has been shown to reduce bad breath odors.
  • Floss at least once a day. Proper flossing removes food particles and plaque from between your teeth, helping to control bad breath.
  • Brush your tongue. Your tongue harbors bacteria, so carefully brushing it may help reduce odors. People who have a coated tongue from a significant overgrowth of bacteria (from smoking or dry mouth, for example) may benefit from using a tongue scraper. Or use a toothbrush that has a built-in tongue cleaner.
  • Clean your dentures or dental appliances. If you wear a bridge or a partial or complete denture, clean it thoroughly at least once a day or as directed by your dentist. If you have a dental retainer or mouth guard, clean it each time before you put it in your mouth. Your dentist can recommend the best cleaning product.
  • Avoid dry mouth. To keep your mouth moist, avoid tobacco and drink plenty of water — not coffee, soft drinks or alcohol, which can lead to a drier mouth. Chew gum or suck on candy — preferably sugarless — to stimulate saliva. If you have chronic dry mouth, your dentist or physician may prescribe an artificial saliva preparation or an oral medication that stimulates the flow of saliva.
  • Adjust your diet. Avoid food and beverages that can cause bad breath. Avoid sticky, sugary foods.
  • Regularly get a new toothbrush. Change your toothbrush when it becomes frayed, about every three to four months, and choose a soft-bristled toothbrush.
  • Schedule regular dental checkups. See your dentist on a regular basis — generally once or twice a year — to have your teeth or dentures examined and cleaned.
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