Bad breath, or halitosis, is an unpleasant smell coming from the mouth. Halitosis can occur on occasion, or it can be a chronic condition. It may be caused by foods a person eats, poor oral hygiene, infection disease, side effect of some medications or other factors.

Halitosis, or bad breath, can be cured with treatment of the underlying causes.

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Symptoms of bad breath include unpleasant odor or taste in the mouth, dry mouth, or white coating on the tongue.

Bad breath can usually be prevented by proper tooth brushing, quitting smoking, and avoiding foods that cause bad breath odors.

Causes of bad Breath (Halitosis)

Bad breath, medically known as halitosis, is a common problem. Bad breath is usually simple and preventable. Dietary factors as well as tobacco and alcohol use may all be factors in causing bad breath. Poor oral hygiene, gum disease, tooth decay, or mouth infections can also be causes of halitosis. Infections in the lungs, sinuses, or airways can also cause bad breath due to the presence of nasal secretions that may drain into the mouth. Chronic postnasal drip, for example as occurs with sinus infections, can be a cause of bad breath. Coughing up sputum from lung infections can also cause bad breath.

What are the causes and health risk factors of bad breath?

There are many risk factors and causes for halitosis. Some common causes of halitosis include the following:

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Food: Food is a primary source of bad odors that come from the mouth. Some foods, such as garlic, onions, spicy foods, exotic spices (such as curry), some cheeses, fish, and acidic beverages such as coffee can leave a lingering smell. Most of the time the odor is short lived. Other foods may get stuck in the teeth, promoting the growth of bacteria and dental plaques, which causes bad breath odor. Low carbohydrate diets may also cause “ketone breath.” These diets cause the body to burn fat as its energy source. The end-product of making this energy is ketones, which cause a fruity acetone-like odor on the breath when exhaled. This fruity odor in a diabetic might indicate uncontrolled blood sugars.

Tobacco products: Smoking and chewing tobacco can leave chemicals that remain in the mouth. Smoking can also precipitate other bad-breath causes such as gum disease or oral cancers.

Poor oral health: When a person does not brush or floss his/her teeth regularly, food particles remaining in the mouth can rot and cause bad odors. Poor dental care can lead to a buildup of plaque in the mouth, which causes an odor of its own. Plaque buildup on the teeth can also lead to an unhealthy condition called periodontal (gum) disease. When plaque hardens, it is referred to as tartar (calculus). Tartar holds bacteria that can irritate the gums and lead to gum disease. The mild form of gum disease is called gingivitis; if gingivitis is not treated, it can advance to periodontitis.

Health problems: Sinus infections, pneumonia, sore throat (pharyngitis) and other throat infections, the common cold, influenza (flu), tonsil stones (tonsilloliths), thrush, bronchitis, postnasal drip, diabetes, acid reflux (gastroesophageal reflux disease or GERD), lactose intolerance, other stomach or digestion problems, and some liver diseases or kidney diseases may be associated with bad breath.

Dry mouth: Also called xerostomia, dry mouth can also cause bad breath. Saliva helps moisten and cleanse the mouth, and when the body does not product enough saliva, bad breath may result. Dry mouth may be caused by salivary gland problems, connective tissue disorders (Sjögren’s syndrome), medications, or breathing through the mouth.

Allergies: Many medications used to treat allergies can cause dry mouth, another cause of halitosis. In addition, post-nasal drip is a common allergy symptom that can result in bad breath. Sinus congestion due to allergies can also cause people to breathe from their mouths, causing dry mouth.

Mouth infections: Cavities, gum disease, or impacted teeth may cause bad breath.

Dentures or braces: Food particles not properly cleaned from appliances such as braces can rot or cause bacteria and odor. Loose-fitting dentures may cause sores or infections in the mouth, which can cause bad breath.

Medications: Many medications, including antihistamines to treat allergies and diuretics, can cause dry mouth which can cause bad breath. Other medications that may lead to bad breath may include triamterene (Dyrenium) and paraldehyde.

“Morning breath”: Bad breath in the morning is very common. Saliva production nearly stops during sleep, allowing odor-causing bacteria to grow, causing bad breath.

Pregnancy: Being pregnant does not cause bad breath, but the nausea and morning sickness common during pregnancy may cause bad breath. In addition, hormonal changes, dehydration, and eating different foods due to cravings may also contribute to bad breath during pregnancy.

Other causes of bad breath: Objects stuck in the nose (usually in children), alcoholism, and large doses of vitamin supplements may also cause bad breath.

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What signs and symptoms may be associated with bad breath?

It is generally simple how to tell if you have bad breath. Others may notice someone has halitosis before the person does, so another person may tell him or her about their bad breath or give them a larger than normal personal space. The most obvious sign or symptom of bad breath is noticing an unpleasant smell coming from the mouth.

Other signs and symptoms of bad breath include

Unpleasant or sour taste or changes in taste,

Dry mouth, and

A white coating on the tongue

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Bad breath in babies or young children may be a sign of infection or undiagnosed medical problems. Consult a child’s pediatrician or dentist if an infant or young child has bad breath.

When should someone see a health care professional about bad breath?

If proper oral hygiene does not get rid of bad breath, see a dentist or doctor for a diagnosis if bad breath is accompanied by

Persistent dry mouth,

Sores in the mouth,

Pain or difficulty with chewing or swallowing,

Broken teeth or dental pain,

White spots on the tonsils, and/or

Fever or fatigue

Also see a doctor or dentist if bad breath develops after taking a new medication, after recent dental surgery, or any other symptoms develop that are of concern.

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How do health care professionals diagnose halitosis?

You have halitosis if you have bad breath, and a doctor is not needed to diagnose the condition. However, if your bad breath is chronic, if it does not go away with proper oral hygiene, or you have other symptoms, you will need to see a doctor or dentist to diagnose the underlying cause.

A doctor or dentist will examine your mouth to look for signs of gum disease, dry mouth, or infections that may be the cause of your bad breath.

There are some things a person can do to eliminate or at least temporarily mask bad breath.

Good oral hygiene: Brushing the teeth and tongue, and flossing, keeps the mouth healthy and can often get rid of bad breath, at least in the short term.

Mouthwash may temporarily mask bad breath and can help with oral hygiene.

Chewing sugarless gum or sucking on sugar-free mints may temporarily mask bad breath odor.