Bad breath: main causes and how to get rid of it

A common myth associates bad breath primarily with the stomach. In fact, in most cases, its source is located directly in the oral cavity - on the tongue, between the teeth, in plaque or periodontal pockets. Much less often, the cause is diseases of the nose, tonsils, respiratory tract, gastroesophageal reflux or systemic diseases.

To truly get rid of an unpleasant odor, it is important not to mask it with chewing gum or mouthwash, but to identify the source.

The material is for informational purposes only. Self-medication can be harmful to health. If bad breath persists, recurs, or is accompanied by other symptoms, you should first consult a doctor or dentist.

What is halitosis?

Halitosis is a persistent or regularly recurring unpleasant odor of exhaled air.

It is important to distinguish it from a temporary odor after certain foods, alcohol, or waking up in the morning. If a person has eaten garlic and has a characteristic odor for several hours, this does not mean that they have a disease.

Persistent halitosis has a different mechanism. One of the main sources of odor is volatile sulfur compounds, which are formed as a result of the vital activity of bacteria. Particularly favorable places for them are the back of the tongue, dental plaque and periodontal pockets.

Why does my mouth smell bad in the morning?

Morning odor in most people has a physiological explanation.

During sleep, saliva production decreases. Saliva normally helps to clean the oral cavity from food debris and inhibit the growth of microorganisms. When it decreases, bacteria are more active in producing substances with a characteristic odor.

The situation can be worsened by:

• sleeping with your mouth open;

• stuffy nose;

• snore;

• insufficient fluid intake;

• alcohol the day before;

• smoking;

• insufficient cleaning of teeth and tongue before bedtime.

If the smell disappears after brushing your teeth, tongue, and breakfast in the morning, this usually does not indicate a pathology.

Another situation is when the smell is very pronounced and persists throughout the day.

The most common cause is bacteria in the mouth

Most cases of persistent bad breath are associated with the oral cavity.

Bacteria accumulate:

• in dental plaque;

• between the teeth;

• on the back of the tongue;

• around the gums;

• in periodontal pockets;

• near poorly cleaned crowns and bridges;

• around orthodontic structures;

• on insufficiently cleaned dentures.

A regular toothbrush cannot effectively clean all the spaces between your teeth. That is why daily hygiene involves separate cleaning between your teeth with floss or appropriate interdental products.

Plaque on the tongue

The tongue is often underestimated when it comes to oral care.

Its surface has a complex relief, which can trap bacteria, dead cells, food debris, and mucus. Microorganisms accumulate especially close to the root of the tongue.

Therefore, a person can brush their teeth thoroughly twice a day and still have bad breath.

Gently cleaning the tongue once a day with a special scraper or the appropriate surface of a toothbrush is part of the recommendations for controlling bad breath.

You don't need to press so hard that it causes pain or bleeding.

Cavities and dental problems

Cavities don't always cause odor on their own, especially in the early stages. However, large cavities can trap food debris and bacterial plaque.

The cause of the smell can also be:

• infected tooth;

• the crown part of the tooth is destroyed;

• inflammation around the tooth;

• unsuccessful restorations, near which plaque accumulates;

• areas that are difficult to clean.

If you also have toothache, sensitivity, swelling, or an unpleasant taste, a dental examination is needed.

Gingivitis and periodontitis

The condition of the gums has a direct connection with bad breath.

Gingivitis causes the gums to become inflamed, red, and may bleed. If the disease progresses to periodontitis, deeper pockets form between the gums and teeth, where bacteria can accumulate.

Gum disease is one of the most common pathological causes of halitosis.

Signs that should not be ignored:

• regular bleeding gums;

• edema;

• exposure of tooth necks;

• unpleasant taste;

• tooth mobility;

• discharge from under the gums;

• persistent odor despite home hygiene.

In such a situation, mouthwash will not eliminate the cause: gum treatment and professional plaque removal are required.

Dry mouth

Saliva performs a natural cleansing function. It washes away food particles, helps control microorganisms, and maintains dental health.

When there is not enough saliva, xerostomia, or dry mouth, occurs. It increases the risk of tooth decay, oral infections, and bad breath.

Possible causes of dryness:

• insufficient fluid intake;

• breathing through the mouth;

• prolonged nasal congestion;

• smoking;

• alcohol;

• some medications;

• radiation therapy to the head and neck area;

• Sjogren's syndrome;

• some other diseases.

If dry mouth occurs after starting a medication, do not stop taking it on your own. Hundreds of medications can reduce salivation, so a possible replacement or dose change should be discussed with your doctor.

Why odor may appear during fasting and diets

Long gaps between meals and strict diets can also affect the smell.

One reason is a decrease in salivation. Especially during significant carbohydrate restriction, the body begins to produce ketone bodies more actively. Some of these substances are excreted through the lungs, which is why breath can acquire a specific odor.

This is not the same as regular bacterial halitosis.

It is extremely important to distinguish diet odor from potentially dangerous conditions. A strong fruity or acetone odor along with excessive thirst, frequent urination, nausea, vomiting, abdominal pain, drowsiness, or rapid breathing may be a sign of diabetic ketoacidosis, an emergency condition.

Garlic, onions and other products

Sometimes the reason is obvious.

Garlic, onions, and some spices contain volatile compounds that, after digestion, can enter the bloodstream, then the lungs, and be exhaled with exhaled air.

That's why simply brushing your teeth doesn't always immediately eliminate this odor. Some of the substances come not from the oral cavity, but directly from the exhaled air.

In this case, the problem goes away after the body eliminates the relevant compounds.

Smoking and alcohol

Smoking affects smell in several ways.

Tobacco smoke has its own persistent aroma, and smoking can change the oral environment, contribute to dryness, and increase the risk of gum disease.

Alcohol can also worsen the condition, especially when consumed regularly or in large quantities. One factor is dry mouth.

Therefore, chewing mint gum after a cigarette only solves the problem for a very short time.

Braces, mouthguards, dentures and bridges

Orthodontic and dental braces create additional areas where food can get trapped and plaque can accumulate.

Special attention is required for:

• braces;

• retainers;

• orthodontic plates;

• mouthguards;

• bridge prostheses;

• removable dentures;

• implant designs.

The mere fact of wearing braces or dentures should not cause halitosis. The odor more often means that a certain area is not being cleaned enough or there is inflammation.

For such designs, the dentist can select appropriate interdental brushes, special floss, or other tools.

Stones in the tonsils

Small whitish formations in the recesses of the tonsils are called tonsilloliths, or tonsil stones.

They may contain cell debris, food, bacteria, and minerals. Because of the bacteria, tonsil stones sometimes have a strong, unpleasant odor.

The following may indicate a possible problem:

• feeling of a foreign object in the throat;

• characteristic white dots on the tonsils;

• unpleasant taste;

• recurring bad breath.

The cause in such a situation is assessed by an otolaryngologist.

Nose, sinuses and postnasal drip

Halitosis can be associated with diseases of the nose and paranasal sinuses.

With sinusitis, chronic inflammation, or postnasal drip, mucus moves down the back of the throat. This can create conditions for bacteria to build up and cause odor.

The following may indicate an ENT cause:

• constant nasal congestion;

• thick discharge;

• pain or pressure in the facial area;

• constant mucus dripping down the throat;

• cough;

• an odor that is more noticeable when exhaling through the nose.

Purulent nasal discharge along with fever and severe deterioration in well-being requires medical evaluation.

Can the smell come from the stomach?

Maybe, but much less often than is often believed.

Normally, the esophagus does not remain a permanently open passage between the stomach and the mouth. Therefore, “poor digestion” in itself is not a typical cause of halitosis.

One possible exception is gastroesophageal reflux disease, which is when stomach contents flow back up into the esophagus and sometimes into the mouth.

Typical accompanying symptoms:

• heartburn;

• sour or bitter taste;

• eructation;

• worsening of symptoms after eating;

• discomfort in the lying position;

• sometimes hoarseness or cough.

Bad breath is one of the possible manifestations of acid reflux.

But if there is halitosis without symptoms from the digestive system, it is more logical to first check the teeth, gums, tongue, and the condition of the oral cavity.

How to get rid of bad breath

The method depends on the cause. There is no one-size-fits-all pill or mouthwash that will cure all types of halitosis.

Brush your teeth twice a day.

The basic recommendation is to brush your teeth with fluoride toothpaste twice a day for about two minutes.

Special attention should be paid to the gum line and back teeth.

Pressing too hard does not improve the result and can injure the gums.

Clean the spaces between your teeth

The brush does not physically reach all contact surfaces.

To clean between teeth, you can use:

• dental floss;

• interdental brushes;

• other special tools selected by the dentist.

It is recommended to do this regularly, usually once a day.

Don't forget about the tongue

If there is noticeable plaque, especially on the back of the tongue, it should be carefully removed.

The scraper is moved from the deepest part of the tongue to the tip without excessive pressure. A few passes are usually sufficient.

Maintain normal salivation

If dry mouth is the cause, the following may help:

• sufficient amount of fluid;

• regular sips of water;

• sugar-free chewing gum;

• quitting tobacco;

• alcohol restrictions;

• treatment of the causes of constant mouth breathing.

With prolonged xerostomia, its cause must be established, as dryness increases the risk of dental problems.

Does mouthwash help?

It doesn't always help the same way.

A cosmetic mint mouthwash may simply mask the odor for a short time. Treatments with certain antibacterial ingredients may reduce the bacterial load or the amount of volatile sulfur compounds.

Mouthwash does not replace brushing, tongue cleaning, and interdental cleaning.

Chlorhexidine products should not be used for long periods of time without supervision: they can cause tooth discoloration and taste changes. It is best to coordinate their use with your dentist.

What doesn't work or only works temporarily

Chewing gum, mints, and sprays may be helpful after meals, but they do not treat cavities, periodontitis, or infection.

You also shouldn't try to constantly interrupt the smell:

• coffee;

• mint candies;

• very strong rinse agents;

• flavored sprays.

If the problem returns immediately after the minty taste disappears, you need to look for the cause.

How to tell if you have a bad odor

It is difficult to assess one's own breath. The sense of smell adapts to constant smells, so a person may simply stop noticing them.

Home tests like "breathing into your palm" are unreliable.

If you are really concerned, the easiest option is to ask someone you trust. During a professional evaluation, your dentist may also separately check your breath and nose, and assess the condition of your tongue, teeth, and gums.

There is also the opposite situation: a person is convinced that they have a strong odor, although the environment and the dentist do not confirm it. This condition is sometimes called pseudohalitosis or halitophobia.

Which doctor to consult?

For persistent odor without an obvious cause, the first step should usually be a dentist.

He can check:

• caries;

• gingivitis;

• periodontitis;

• tartar;

• tongue condition;

• prostheses and restorations;

• other oral problems.

If there is no dental cause, the next step depends on the symptoms. For nasal congestion and tonsil problems, an ENT specialist is needed, and for severe heartburn and reflux, an appropriate medical evaluation is needed.

When an unpleasant odor needs special attention

It is worth contacting a dentist if the smell does not go away after several weeks of proper home hygiene or if there is:

• bleeding or swelling of the gums;

• toothache;

• mobility of permanent teeth;

• purulent discharge;

• problems with dentures;

• constant pronounced dryness in the mouth.

Fever with purulent nasal discharge or phlegm, as well as unusual visible lesions or ulcers in the mouth, require prompt medical evaluation.

And a fruity or acetone odor along with symptoms of possible diabetic ketoacidosis — nausea, vomiting, excessive thirst, frequent urination, drowsiness, or unusually deep or rapid breathing — requires immediate medical attention.

Conclusion

Bad breath often starts in the mouth. The main causes are bacterial plaque on the tongue and teeth, gum disease, insufficient cleaning between the teeth, and dry mouth.

If the problem occurs after sleeping or eating a certain food and quickly disappears after hygiene, it is usually a temporary phenomenon. If the smell has become permanent, does not disappear after careful care, or is accompanied by other symptoms, there is no point in masking it. It is necessary to determine the source - first of all, check the condition of the teeth, gums and oral cavity.

FAQ

Why does my mouth stink even if I brush my teeth?

The cause may be on the tongue, between the teeth, or under the gums—places that a regular toothbrush doesn't clean well enough. It's also worth ruling out cavities, periodontitis, dry mouth, tonsil problems, and other causes.

How to quickly remove bad breath?

Water, brushing your teeth and tongue after meals, and chewing sugar-free gum can help. But if the smell is persistent, quick fixes only mask the problem. You need to treat the cause.

Why does my mouth smell bad in the morning?

At night, saliva production decreases, so bacteria accumulate more actively in the oral cavity. The smell can be stronger if you sleep with your mouth open, smoke, drink alcohol, and do not have enough hygiene in the evening.

Can bad breath be caused by the stomach?

Yes, for example, with gastroesophageal reflux, but gastrointestinal diseases are a much rarer cause than problems in the oral cavity. If there are no other digestive system symptoms, it is usually logical to start the examination with a dentist.

Does chewing gum help with bad breath?

Sugar-free gum may temporarily freshen breath and stimulate saliva production. It does not treat cavities, gingivitis, or other causes of persistent halitosis.

Do you need to brush your tongue every day?

If you are prone to plaque and odor, careful daily cleaning of your tongue can be a useful part of hygiene. Pay special attention to the back of the tongue, where bacteria often accumulate.

Which rinse aid is better for bad odor?

Conventional cosmetic rinses mostly mask the odor. Treatments may contain antibacterial ingredients or substances that affect volatile sulfur compounds. The specific remedy should be chosen according to the cause of the problem.

Can dry mouth cause halitosis?

Yes. When saliva production is insufficient, the natural cleansing of the oral cavity is impaired, so bacteria and food debris accumulate more quickly. Persistent dryness requires clarification of the cause.

Which doctor should I go to if I have bad breath?

In most cases, it is best to start with a dentist, as the source is most often in the mouth. If a dental cause is not found, further evaluation depends on the accompanying symptoms.

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