What Does Bad Breath Have to Do with Diabetes?

Bad Breath And Diabetes

Your breath has an interesting ability to provide clues to your overall health. A sweet, fruity odor can be a sign of ketoacidosis, an acute complication of diabetes. An odor of ammonia is associated with kidney disease. Similarly, a very foul, fruity odor may be a sign of anorexia nervosa. Other diseases, such as asthma, cystic fibrosis, lung cancer, and liver disease, also can cause distinct odors on the breath.

Bad breath, also called halitosis, can be so telling that doctors may even be able to use it to identify diabetes. Recently, researchers have found that infrared breath analyzers can be effective in identifying prediabetes or early-stage diabetes.

What Causes Bad Breath In Diabetes?

Diabetes-related halitosis has two main causes: periodontal disease and high levels of ketones in the blood.

Periodontal Diseases

Periodontal diseases, also called gum diseases, include gingivitis, mild periodontitis, and advanced periodontitis. In these inflammatoryTrusted Source diseases, bacteria attack the tissues and bone that support your teeth. Inflammation can affect metabolism and increase your blood sugar, which worsens diabetes.

While diabetes can lead to periodontal diseases, these diseases can also create further problems for people with diabetes. According to a report in IOSR Journal of Dental and Medical Sciences, an estimated one in three people with diabetes will also experience periodontal diseases. Heart disease and stroke, which can be complications of diabetes, are also linked to periodontal disease.

Diabetes can damage blood vessels, which can reduce blood flow throughout your body, including your gums. If your gums and teeth aren’t receiving a proper supply of blood, they may become weak and more prone to infection. Diabetes may also raise glucose levels in your mouth, promoting bacteria growth, infection, and bad breath. When your blood sugars are high, it becomes hard for the body to fight infection, which makes it harder for the gums to heal.

If someone with diabetes gets a periodontal disease, it may be more severe and take longer to heal than in a person without diabetes.

Bad breath is a common sign of periodontal disease. Other signs include:

  1. red or tender gums
  2. bleeding gums
  3. sensitive teeth
  4. receding gums


When your body can’t make insulin, your cells don’t receive the glucose they need for fuel. To compensate, your body switches to plan B: burning fat. Burning fat instead of sugar produces ketones, which build up in your blood and urine. Ketones can also be produced when you’re fasting or if you’re on a high-protein, low-carbohydrate diet, although not to the same level as they are in diabetic ketoacidosis.

High ketone levels often cause bad breath. One of the ketones, acetone (a chemical found in nail polish), can cause your breath to smell like nail polish.

When ketones rise to unsafe levels, you’re at risk of a dangerous condition called diabetic ketoacidosis (DKA). Symptoms of DKA include:

  1. a sweet and fruity odor on your breath
  2. more frequent urination than normal
  3. abdominal pain, nausea, or vomiting
  4. high blood glucose levels
  5. shortness of breath or difficulty breathing
  6. confusion

DKA is a dangerous condition, mostly limited to people with type 1 diabetes whose blood sugars are uncontrolled. If you have these symptoms, seek medical help immediately.

Managing Bad Breath From Diabetes

Along with neuropathy, cardiovascular disease, and others, periodontitis is a common complication of diabetes. You can, however, take steps to stave off gum diseases or to lessen their severity. Take control with these daily tips:

  1. Brush your teeth at least twice a day and floss daily.
  2. Don’t forget to brush or scrape your tongue, a prime breeding place for foul-smelling bacteria.
  3. Drink water and keep your mouth moist.
  4. Keep your blood sugar levels in their target range.
  5. Use sugar-free mints or gum to stimulate saliva.
  6. Visit your dentist regularly and follow their treatment recommendations. Make sure the dentist knows you have diabetes.
  7. Your doctor or dentist may prescribe a medication to stimulate the production of saliva.
  8. If you wear dentures, make sure they fit well and take them out at night.
  9. Don’t smoke.


Bad breath may be a sign of something more. If you have diabetes, it’s important to be aware of what your breath may be telling you. Your understanding may save you from advanced gum disease or the dangers of DKA.


· Dillon, E. L., Janghorbani, M., Angel, J. A., Casperson, S. L., Grady, J. J., Urban, R. J., … Sheffield-Moore, M. (2009). Novel noninvasive breath test method for screening individuals at risk for diabetes. Diabetes Care, 32(3), 430-435 care.diabetesjournals.org/content/32/3/430.long

· Loesche, W. J., & Kazor, C. (2002). Microbiology and treatment of halitosis. Periodontology, 28(1), 256-279. Retrieved from onlinelibrary.wiley.com/enhanced/doi/10.1034/j.1600-0757.2002.280111.x/

· Oral health: Working to improve oral health for all Americans at a glance 2016. (2016)

· Singh, B., & Singh, R. (2013). Gingivitis–A silent disease. IOSR Journal of Dental and Medical Sciences, 6(5), 30-33. Retrieved from iosrjournals.org/iosr-jdms/papers/Vol6-issue5/H0653033.pdf

Important Notice: This article was originally published at www.healthline.com by Susan York Morris where all credits are due. Medically reviewed by Peggy Pletcher, M.S., R.D., L.D., CDE.