Oral Health and Diabetes: How Your Teeth, Gums and Blood Glucose Are Connected
How diabetes can affect your gums, teeth, saliva and mouth — and how to protect them
Oral Health and Diabetes: What You Need to Know
Living with diabetes can affect many parts of the body, including your teeth, gums and mouth. Higher blood glucose levels can increase the risk of gum disease, tooth decay, dry mouth, oral thrush and slower healing after dental treatment1.
The connection also works both ways. Gum disease may make blood glucose harder to manage, while looking after your oral health can support your overall diabetes care2.
The Good News:
Many diabetes-related oral health problems can be prevented or managed with regular dental visits, daily brushing and cleaning between teeth, and keeping your dentist informed about your diabetes and medications3.
Why Oral Health Matters When You Have Diabetes
Diabetes affects more than blood glucose levels. It can also affect the mouth, gums, saliva, healing and the body's ability to manage infection1. In Australia, an estimated 6.5% of adults — around 1.3 million people — had diabetes in 2022–24, including people with known and newly diagnosed diabetes4.
Oral health is also a major health issue in its own right. Poor oral health, including tooth decay, gum disease and tooth loss, affects many Australians and can impact eating, speaking, confidence, wellbeing and general health5.
For people living with diabetes, the mouth can sometimes show early signs that something has changed. Sore gums, bleeding, dry mouth, bad breath, loose teeth or white patches in the mouth should not be ignored6.
How Diabetes Can Affect Your Teeth and Gums
Diabetes may increase your risk of several oral health problems, especially when blood glucose levels are not well managed1. Common oral health concerns linked with diabetes include:
- • Gum disease, including gingivitis and periodontitis
- • Dry mouth, which can increase the risk of tooth decay
- • Tooth decay, especially when saliva levels are low
- • Oral thrush, a fungal infection that can cause white patches in the mouth
- • Delayed wound healing after mouth ulcers, dental treatment or oral wounds
- • Difficulty with the gums attaching to the teeth when blood glucose levels are high
- • Periodontal abscesses, which can cause blood glucose to spike
- • Changes in taste
- • Bad breath or a persistent bad taste
These issues can affect comfort, eating, confidence and long-term tooth health.
Gum Disease, Dry Mouth and Tooth Decay
Diabetes and Gum Disease
Gum disease is one of the best-known oral health complications associated with diabetes1. Early gum disease may cause red, swollen or bleeding gums. More advanced gum disease, known as periodontitis, can damage the bone and tissues that hold teeth in place1. High blood glucose levels can also make it harder for the gums to attach to the teeth, and can delay wound healing in the mouth, which makes gum problems slower to recover1. Signs of gum disease can include:
- • Bleeding gums
- • Red, swollen or tender gums
- • Bad breath
- • Sensitive teeth
- • Gums pulling away from the teeth
- • Loose teeth
- • Teeth looking longer than they used to
- • New gaps between teeth
To learn more about how blood sugar and gum health affect each other — including how periodontitis is diagnosed and treated — read our detailed guide to diabetes and periodontal disease.
Gum disease is more common and can be more severe when blood glucose levels are not within a healthy range2. The Australian Dental Association's oral health information site also notes a two-way relationship between periodontitis and diabetes, where periodontitis may negatively affect blood glucose levels and people with periodontitis may have poorer glycaemic status1. A periodontal abscess — a pocket of infection in the gum — can cause a blood glucose spike that is harder to manage with your usual diabetes medications, so prompt dental treatment is important.
Dry Mouth and Tooth Decay
Saliva helps protect teeth by washing away food particles, buffering acids and supporting a healthier mouth environment. Diabetes can contribute to reduced saliva or dry mouth, and dry mouth can increase the risk of tooth decay1. Higher glucose levels may also increase glucose in saliva, which can encourage plaque build-up and create conditions that make tooth decay more likely2. Dry mouth may feel like:
- • A sticky or dry feeling in the mouth
- • Frequent thirst
- • Difficulty chewing, swallowing or speaking
- • Cracked lips
- • Bad breath
- • A burning feeling in the mouth
If dry mouth is ongoing, speak with your dentist, GP or diabetes educator. Drinking water regularly and chewing sugar-free gum may help stimulate saliva flow, but persistent symptoms should be checked3.
Diabetes and Oral Thrush
Oral thrush, also called oral candidiasis, is a fungal infection that can occur in and around the mouth. People with diabetes may be more prone to oral thrush because of factors such as high glucose in saliva, dry mouth and reduced resistance to infection2. Symptoms may include:
- • White patches on the tongue, cheeks or roof of the mouth
- • Redness or soreness under white patches
- • A burning feeling
- • Cracking at the corners of the mouth
- • Changes in taste
A dentist or doctor can assess oral thrush and recommend appropriate treatment.
Dental Warning Signs to Act On Early
Book a dental appointment if you notice:
NSW Health recommends telling your healthcare provider about teeth and gum problems and telling your dentist about your diabetes, other health conditions and medicines6.
How to Protect Your Oral Health If You Have Diabetes
A good daily oral care routine can reduce your risk of dental complications and support your general health.
1. Brush Twice a Day
Brush your teeth and gums twice daily with fluoride toothpaste3. Use a soft toothbrush and take care along the gumline, where plaque often builds up.
2. Clean Between Your Teeth Every Day
A toothbrush cannot clean every surface between teeth. Use dental floss, interdental brushes or another dentist-recommended option once a day3.
3. See Your Dentist Regularly
People living with diabetes should visit their dentist regularly. Better Health Channel recommends dental visits every 6 to 12 months so a dentist can check the mouth, teeth and gums, clean the teeth professionally and provide personalised advice2.
Your dentist may recommend more frequent visits if you have gum disease, dry mouth, tooth decay, dentures, implants or other oral health concerns.
4. Tell Your Dentist You Have Diabetes
Let your dentist know:
- • That you have diabetes
- • How your diabetes is managed
- • Any medicines you take
- • Any recent changes in blood glucose levels
- • Whether you have had slow healing or infections
- • Any planned medical treatment
This helps your dental team plan safe, appropriate care.
5. Keep Blood Glucose as Close to Target as Possible
Following your GP's, endocrinologist's or diabetes educator's advice for blood glucose management can help reduce your risk of oral health complications2. Use our directory of diabetes healthcare professionals to find support near you.
6. Choose Water as Your Everyday Drink
NSW Health recommends choosing water as your everyday drink and limiting foods and drinks high in sugar, such as soft drinks, lollies, cakes and other sweet snacks6.
7. Avoid Smoking
Smoking increases the risk of gum disease and can make gum disease worse2. If you smoke, speak with your GP, dentist or Quitline for support.
8. Take Care After Treating a Hypo
If you use fast-acting carbohydrates such as jellybeans, soft drink, fruit juice or sugar to treat a hypoglycaemic episode, rinse your mouth with water afterwards. NSW Health advises avoiding brushing immediately after a hypo and rinsing with water instead6.
When to Seek Urgent Advice
Seek prompt dental or medical advice if you have swelling of the face or jaw, severe dental pain, fever, pus, difficulty swallowing, uncontrolled bleeding, or a mouth infection that is worsening. If symptoms are severe or you feel very unwell, seek urgent medical care.
The Bottom Line
Oral health and diabetes are closely connected. Looking after your teeth and gums can help protect your smile, reduce your risk of infection and support your overall diabetes care. Brush twice daily, clean between teeth, drink water, avoid smoking, manage blood glucose as advised and see your dentist regularly.
Frequently Asked Questions
Can diabetes cause gum disease?
Diabetes can increase the risk of gum disease, particularly when blood glucose levels are not well managed. Gum disease may also make blood glucose harder to manage, which is why dental care should be part of diabetes care.
What are the first mouth signs of diabetes-related problems?
Common warning signs include bleeding gums, red or swollen gums, bad breath, loose teeth, sensitive teeth, dry mouth, changes in taste and white patches in the mouth.
How often should people with diabetes see a dentist?
Many people with diabetes are advised to see a dentist every 6 to 12 months, although your dentist may recommend a different schedule based on your oral health, gum health and risk factors.
Can dry mouth increase tooth decay?
Yes. Saliva helps protect teeth. Reduced saliva or dry mouth can increase the risk of tooth decay and oral infections.
Should I tell my dentist I have diabetes?
Yes. Tell your dentist about your diabetes, how it is managed, any medicines you take and any other health conditions. This helps your dental team tailor care to your needs.
Is gum disease inevitable if I have diabetes?
No. Gum disease is not inevitable. Good oral hygiene, regular dental care and blood glucose management can reduce your risk.
Need Support With Your Diabetes Care?
Connect with healthcare professionals experienced in diabetes care across Australia
References
- Australian Dental Association. Diabetes. Teeth.org.au. Available from: https://www.teeth.org.au/diabetes
- Better Health Channel. Diabetes and oral health. Victorian Government. Available from: https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/diabetes-and-oral-health
- Australian Dental Association. Policy Statement 2.2.3: Oral Hygiene. ADA. Available from: https://ada.org.au/policy-statement-2-2-3-oral-hygiene
- Australian Institute of Health and Welfare. Diabetes: Australian facts. AIHW. Available from: https://www.aihw.gov.au/reports/diabetes/diabetes/contents/summary
- Australian Institute of Health and Welfare. Oral health and dental care in Australia. AIHW. Available from: https://www.aihw.gov.au/reports/dental-oral-health/oral-health-and-dental-care-in-australia
- NSW Health. Diabetes and oral health. NSW Government. Available from: https://www.health.nsw.gov.au/oralhealth/prevention/Pages/diabetes-and-oral-health.aspx
Medical disclaimer: This information is general in nature and is not a substitute for personalised advice from a dentist, GP, endocrinologist or diabetes educator.
Last reviewed: July 2026 · Next review due: July 2027
This website content is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or another qualified health provider with any questions you may have regarding a medical condition.