Dental Hygienist


Bad Breath (Halitosis)

In most cases of persistent bad breath, the smell comes from a build-up of bacteria within the mouth - in food debris, in plaque and gum disease, or in a 'coating' on the back of the tongue. Good oral hygiene will often solve the problem. That is, regular teeth brushing, flossing, cleaning the tongue, and mouthwashes. Other causes of persistent bad breath are uncommon.

What is bad breath?
Bad breath, sometimes called halitosis, means that you have an unpleasant smell on your breath that other people notice when you speak or breathe out. The exact number of people with bad breath is not known, but it is common.

How can I tell if I have bad breath?
A main problem with bad breath is that often the only person not to notice it is the person affected. (You get used to your own smell and do not tend to notice your own bad breath.) Often, the only way to know about it is if a person comments on it. However, most people are too polite to comment on another person's bad breath. You may have to rely on a family member or a close friend to be honest and tell you if you have bad breath.

Perhaps you could ask your dentist next time you have a check-up. A dentist will normally be able to say if you have bad breath. Gum disease is a common cause of bad breath and a dentist will be able to advise on treatment if you have gum disease.

Some people suggest a simple test which you can do yourself to detect bad breath. Lick the inside of your wrist. Wait a few seconds for the saliva to dry. Then smell the licked part of the wrist. If you detect an unpleasant smell you are likely to have bad breath.

What are the causes and types of bad breath?

Coming from within the mouth
Most cases of bad breath come from bacteria (germs) or debris that builds up within the mouth. This is discussed in more detail later in the leaflet.

Morning bad breath
Most people have some degree of bad breath after a night's sleep. This is normal and occurs because the mouth tends to get dry and stagnate overnight. This usually clears when the flow of saliva increases soon after starting to eat breakfast.

Dry mouth (xerostomia)
Bad breath associated with a dry mouth is caused by a reduction in the cleansing mechanism of the mouth as a result of reduced flow of saliva. There are many causes of a dry mouth. The most common cause is after a night's sleep (discussed above). Other causes of a dry mouth include: dehydration, as a side-effect of some drugs (for example, tricyclic antidepressants), as a symptom of some diseases (such as Sjögren's syndrome), and radiotherapy to the head and neck region.

Foods, drinks and medicines
Chemicals in foods can get into the bloodstream, and then be breathed out from the lungs. Most people are familiar with the smell of garlic, spicy foods and alcoholic drinks on the breath of people who have recently eaten or drunk these. Various other foods and medicines can cause a smell on the breath. This type of bad breath is temporary and easily cured by not eating the food. (However, some people eat spiced food every day. As a result, they will constantly have a typical smell on their breath.)

If a medicine is causing the problem then discuss possible alternatives with your doctor. Medicines that have been associated with bad breath include: betel, chloral hydrate, nitrites and nitrates, dimethyl sulfoxide, disulphiram, some chemotherapy drugs, phenothiazines and amfetamines.

Most non-smokers can tell if a person is a smoker by their breath which 'smells like an ashtray'. Stopping smoking is the only cure for this type of bad breath. Smoking also increases the risk of developing gum disease, another cause of bad breath.

Crash dieting or fasting
Can cause a 'sickly sweet smell' on the breath. This is due to chemicals called ketones being made by the breakdown of fat. Some ketones are then breathed out with each breath.

Medical causes
Other medical causes are uncommon. Some people with nose problems can get bad breath. For example, a polyp in your nose, sinusitis or a 'foreign body' stuck in a nostril (occurs most commonly in children) can cause a bad smell. In this situation the smell tends to occur only, or more severely, when you breathe out through your nose. It is not so noticeable when you breathe out through your mouth. Infections or tumours of the lung, throat, mouth or tonsils are sometimes a cause. Other causes are rare.

However, in these 'medical' cases, there are usually other symptoms that would indicate the cause. For example, a blocked nose, sinus pain, chest symptoms, fever, etc. If you are otherwise well and have no other symptoms apart from bad breath, the bad smell is likely to be coming from a build-up of bacteria within the mouth and 'medical' causes are unlikely.

Bad breath coming from within the mouth
In most people who have bad breath the bad smell is thought to come from bacteria and debris within the mouth. As the bacteria break down proteins and other debris in the mouth, they release foul-smelling gases. One or more of the following may contribute to the build-up of bacteria, debris and bad breath:

  1. Food stuck between teeth. Normal teeth brushing may not clear bits of food which can get stuck between teeth. The food then rots and becomes riddled with bacteria. Regular flossing can clear and prevent this problem.
  2. Plaque, calculus and gum disease. Dental plaque is a soft whitish deposit that forms on the surface of teeth. It forms when bacteria combine with food and saliva. Plaque contains many types of bacteria. Calculus, sometimes called tartar, is hardened calcified plaque. It sticks firmly to teeth. Gum disease means infection or inflammation of the tissues that surround the teeth. If your gums look inflamed, or regularly bleed when you clean your teeth, you are likely to have gum disease. The severity can range from mild to severe.
  3. Coating on the back of the tongue. In some people, a 'coating' develops on the back part of the tongue. It is not clear why this occurs. It may be from mucus that drips down from the back of the nose ('post nasal drip'). The coating can contain many bacteria. This explains why bad breath can sometimes occur in people with otherwise good oral hygiene.

Routine oral hygiene - recommended for everyone

The main treatment of bad breath coming from within the mouth is good oral hygiene. Aim to get into a regular habit of good oral hygiene - in particular teeth brushing and flossing.

Teeth brushing
Brush your teeth at least twice a day. Use a soft-tufted brush and a toothpaste that contains fluoride. The head of the brush should be small enough to get into all the areas of the mouth. Spend at least two minutes brushing, covering all areas (the inside, outside, and biting areas of each tooth). Pay particular attention to where the teeth meet the gum. Get a new toothbrush every 3-4 months. Many people find that an electric toothbrush does a better job than the traditional toothbrush, and so they have become popular.

Floss your teeth at least once a day after brushing, and preferably twice a day. The aim is to clean the sides of the teeth where a toothbrush cannot get to, and clear the spaces between teeth (the interdental spaces) of debris. Some people who have not flossed before are surprised as to how much extra debris and food particles can be removed by flossing in addition to brushing.

If you are not sure how to floss, then ask your dentist or dental hygienist. Briefly: the usual floss looks a bit like cotton thread. Cut off about 40 cm. Wind the ends round your middle fingers of each hand. Then grab the floss between the thumbs and first finger to obtain a tight 3-4 cm section which you can pull between teeth. Gently scrape the floss against the sides of each tooth from the gum outwards. Use a fresh piece of floss each time.

Some people prefer floss tape which slides between teeth more easily than normal floss. Also, some people use disposable plastic 'forks' with a small length of floss between the two prongs. These may be easier to hold and manipulate. However, they are expensive. Some people use sticks, or a thin single-tufted brush to clean the space between the teeth.

The gums may bleed a little when you first begin to floss. This should settle in a few days. If it persists then see a dentist as regular bleeding after flossing may indicate gum disease.

Other general tips

Other things which are important to keep your teeth and gums healthy are:

  1. If you smoke, try to stop. Smoking increases the risk of developing gum disease.
  2. Eat a well-balanced healthy diet. In particular, you should limit the amount of sugary foods and drinks that you have. Sugars and sugary foods in the mouth are the main foods that bacteria thrive on to make acid which can contribute to tooth decay.
  3. If children need medicines, wherever possible use sugar-free medicines.
  4. Have regular dental checks at intervals recommended by your dentist (this is normally at least once a year). A dentist can detect excessive build-up of plaque and remove calculus. Early gum disease can be detected and treated to prevent it from getting worse.

Other things you can do if you have bad breath
The measures above are usually sufficient to look after your teeth and to prevent bad breath. However, if you still have bad breath coming from your mouth then the following extra measures will usually cure the problem.

Consider using a mouthwash each day. Chemicals in the mouthwash aim to kill bacteria and/or neutralise any chemicals that cause bad breath. It is difficult to advise on which mouthwash is the most effective. A number of clinical trials have shown that various ingredients are good at reducing bad breath. These include: chlorhexidine, cetylpyridinium chloride, chlorine dioxide, zinc chloride and triclosan. The various mouthwashes that you can buy usually contain one or more of these ingredients, plus various other ingredients.

Note: some people are reluctant to use a chlorhexidine-containing mouthwash long-term. This is because it has an unpleasant taste, can give rise to a burning sensation in the mouth if used too frequently, and can cause (reversible) staining of the teeth. Also, some mouthwashes contain alcohol as one of their ingredients. There is some concern that long-term use of alcohol-containing mouthwashes may be a risk factor in the development of mouth cancer. Also, young children should not use a mouthwash if they may swallow it.

Tongue cleaning
Consider cleaning the back of your tongue each day. Some people do this with a soft toothbrush dipped in mouthwash (not toothpaste). An easier and better way is to buy a special plastic tongue scraper from a pharmacy. You need to place it as far back as you can and then gently scrape forward to clear the tongue of any coating. A review in 2006 (cited at the end) concluded that ... "tongue scrapers or cleaners are slightly more effective than toothbrushes as a means of controlling halitosis in adults".

Chewing gum
Some people chew sugar-free gum after each meal. It is not clear how well gum helps to reduce bad breath but chewing gum increases the flow of saliva. Saliva helps to 'flush' the mouth to help clear any debris remaining from the meal.

If you have dentures and have bad breath
You may not be cleaning them properly. Ask your dentist for advice on cleaning dentures.

When to seek further help

If the bad breath does not go
If you have done everything you can and still have bad breath then see a doctor or dentist. You may need some tests to assess if you have a less common cause of bad breath.

Halitophobia - fear of bad breath
Some people think they have bad breath when they do not, and nobody else can smell it. This can result in odd behaviour to try to minimise what they think of as their bad breath. For example, they may cover their mouth when talking, avoid or keep a distance from other people, or avoid social occasions. People with halitophobia often become fixated with teeth cleaning and tongue cleaning and frequently use chewing gums, mints, mouthwashes, and sprays in the hope of reducing their distress. Treatment from a psychologist may help.Dental hygienists remove soft and hard deposits from teeth, teach patients how to practice good oral hygiene, and provide other preventive dental care. They examine patients' teeth and gums, recording the presence of diseases or abnormalities.

Dental hygienists use an assortment of tools to complete their tasks. Hand and rotary instruments and ultrasonic devices are used to clean and polish teeth, which includes removing tartar, stains, and plaque. Hygienists use x-ray machines to take dental pictures, and sometimes develop the film. They may use models of teeth to explain oral hygiene, perform root planning as a periodontal therapy, or apply cavity-preventative agents such as fluorides and pit and fissure sealants.
Other tasks hygienists may perform vary by State. In some States, hygienists are allowed to administer anesthetics, while in others they administer local anesthetics using syringes. Some States also allow hygienists to place and carve filling materials, temporary fillings, and periodontal dressings; remove sutures; and smooth and polish metal restorations.

Dental hygienists also help patients develop and maintain good oral health. For example, they may explain the relationship between diet and oral health or inform patients how to select toothbrushes and show them how to brush and floss their teeth.
Hygienists sometimes make a diagnosis and other times prepare clinical and laboratory diagnostic tests for the dentist to interpret. Hygienists sometimes work chair-side with the dentist during treatment.


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Ashford Dental Care
Centre for Integral Implant and Aesthetics Dental Care
Upper High Street
8 New Rents, Ashford

Kent TN23 1JJ

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01233 639 289

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Dr Dipesh KH Patel is a Dental Phobia Certified dentist Click Here to verify.

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Last Update: February 2019