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Bad breath is breath that has an unpleasant odor (language Vietnam: hoi mieng ). It's also known as halitosis. This odor can occur from time to time, or it can be long lasting, depending on the cause. Millions of bacteria live in the mouth, particularly on the back of the tongue. In many people, they are the primary causes of bad breath. The mouth's warm, moist conditions are ideal for the growth of these bacteria. Most bad breath is caused by something in the mouth.

Some types of bad breath are considered to be fairly normal. They usually are not health concerns. One example is "morning mouth." This occurs because of alteration in your mouth while you sleep. During the day, saliva washes away decaying food and odors. The body makes less saliva at night. Your mouth becomes dry, and dead cells stick to your tongue and to the inside of your cheeks. When bacteria use these cells for food, they produce a foul odor. Symptoms You may not always know that you have bad breath. That's because odor-detecting cells in the nose eventually get used to the smell. Other people may notice and react by stepping away from you as you speak, or making a face. Diagnosis A dentist or physician may notice bad breath during an office visit. Sometimes, the smell of the patient's breath may suggest a likely cause for the problem. For example, "fruity" breath may be a sign of uncontrolled diabetes. A urine-like smell, especially in a person who is at high risk of kidney disease, can sometimes indicate kidney failure. Your dentist will review your medical history for conditions that can cause bad breath and for medicines that can cause dry mouth. Your dentist also will ask you about your diet, personal habits (smoking, chewing tobacco) and any symptoms. He or she also will ask who noticed the bad breath and when.

Your dentist will examine your teeth, gums, mouth and salivary glands. He or she also will feel your head and neck and will valuate your breath when you exhale from your nose and from your mouth.

Your dentist may refer you to your family physician if an illness is the most likely cause. In severe cases of gum disease, your dentist may suggest that you see a periodontist (dentist who specializes in gum problems).

You will need diagnostic tests if the doctor suspects a lung infection, diabetes, kidney disease, liver disease or Sjgren's syndrome. The type of tests you get depends on the suspected illness. You may get blood tests, urine tests, X-rays of the chest or sinuses, or other tests. ....