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# Diabetes and the mouth

- Mouth and systemic disease

Diabetes worsens gum disease and gum disease makes diabetes harder to control. Dry mouth, thrush and slow healing are common too.

Updated Nov 12, 2026

## Key points

- Diabetes and periodontitis worsen each other.
- Periodontal treatment slightly lowers HbA1c.
- Severe gum disease without a cause: test for diabetes.

## What it is

Diabetes, especially when poorly controlled, increases the risk and severity of periodontitis through impaired neutrophil function, advanced glycation end-products and an exaggerated inflammatory response. Periodontitis in turn adds to systemic inflammation and insulin resistance; periodontal treatment modestly lowers HbA1c. People with diabetes also have more dry mouth, candidiasis, burning mouth, altered taste, delayed healing after extractions and more severe odontogenic infections. Periodontitis can be the first clue to undiagnosed diabetes.

## Oral findings

- Periodontitis is more frequent and severe in diabetes, particularly with high HbA1c.
- Treating periodontitis can lower HbA1c by a small but meaningful amount.
- Dry mouth, candidiasis and slow wound healing are common.
- Hypoglycaemia is a risk during dental visits if meals are skipped.
- Severe dental infections spread faster and need earlier antibiotics and closer follow-up.

## What the doctor does

- Ask every patient with diabetes about bleeding gums, loose teeth and dental visits; include oral health in the annual review.
- Unexplained severe or recurrent periodontal disease: test for diabetes.
- Schedule dental care after a meal, with usual medication, and check glucose if unwell.

## Next step / Initial management

- Refer every person with diabetes to the dentist at least yearly, more often with periodontitis.
- Severe periodontitis or recurrent periodontal abscesses without known diabetes: measure fasting glucose or HbA1c.
- Dental infection with poor glycaemic control: lower the threshold for antibiotics and hospital referral.

## Test yourself

Think of the answer, then tap the question to see it.

## How does periodontal treatment affect glycaemic control in diabetes?

It modestly lowers HbA1c.

## Why are dental infections more dangerous in poorly controlled diabetes?

Impaired neutrophil function and healing let infections spread faster and become more severe.

## What should severe periodontitis of unknown cause prompt?

Testing for diabetes (fasting glucose or HbA1c).

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## Connections

## Related 4

- [Periodontitis: stages, grades and links with general health](https://durgical.com/en/dentistry/periodontitis-stages-grades-and-links-with-general-health/)
- [Oral candidiasis (thrush)](https://durgical.com/en/dentistry/oral-candidiasis/)
- [Dry mouth (xerostomia): approach](https://durgical.com/en/dentistry/dry-mouth-approach/)
- [Medical emergencies in the dental chair](https://durgical.com/en/dentistry/medical-emergencies-in-the-dental-chair/)

## Related conditions 3

- [Type 2 diabetes mellitus](https://durgical.com/en/conditions/type-2-diabetes-mellitus/)
- [Type 1 diabetes mellitus](https://durgical.com/en/conditions/type-1-diabetes-mellitus/)
- [Periodontitis](https://durgical.com/en/conditions/periodontitis/)

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Educational content; it does not replace assessment by a dentist or doctor and is not a clinical instruction. For facial or neck swelling with difficulty swallowing or breathing, a knocked-out tooth or bleeding that will not stop, go to an emergency department at once.

Sources: [Type 2 Diabetes](https://www.ncbi.nlm.nih.gov/books/NBK513253/) (StatPearls Publishing (NCBI Bookshelf), 2024); [Periodontitis](https://www.ncbi.nlm.nih.gov/books/NBK541126/) (StatPearls Publishing (NCBI Bookshelf), 2023); [Oral Health Considerations for Patients With Systemic Disease](https://www.ncbi.nlm.nih.gov/books/NBK617063/) (StatPearls Publishing (NCBI Bookshelf), 2025).

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Representative model, for educational purposes only.

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Source: https://durgical.com/en/dentistry/diabetes-and-the-mouth/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/dentistry/diabetes-and-the-mouth/