The mouth–body connection: Why diabetes and oral health go hand in hand

The mouth–body connection: Why diabetes and oral health go hand in hand

Every November, National Diabetes Month invites South Africans to take a closer look at one of the country’s most urgent health concerns, and one that’s still growing rapidly. But beyond blood sugar and diet, there’s another piece of the puzzle that often goes unnoticed: the link between oral health and diabetes.

“If you or someone you love is living with diabetes, you’re likely aware that it can affect the eyes, nerves and heart,” explains Dirna Grobbelaar, Oral Hygiene Advisor for Ivohealth. “What’s less widely known is that it also has a profound impact on the mouth, and that poor oral health can, in turn, make diabetes harder to control. This two-way relationship highlights how deeply the health of our mouth and body are connected.”

Diabetes in focus

Diabetes is a long-term condition that affects how the body regulates glucose, the main source of energy for our cells. There are two primary forms: type 1, which usually develops earlier in life, and type 2, which is far more common and often linked to lifestyle factors.

Globally, the number of people living with diabetes continues to surge. Here in South Africa, around 12.9% of adults are estimated to have the condition, and many don’t yet know it. According to the International Diabetes Federation, diabetes has become the leading cause of death among women and the second among men in South Africa.

When the gums suffer, so does the body

Gum disease (or periodontal disease) is among the most common health problems worldwide, affecting roughly nine out of ten people at some stage in life. It begins quietly, when sticky plaque, a biofilm full of bacteria, builds up on the teeth and gumline. The gums become irritated, inflamed and may bleed during brushing or flossing.

“The early stage, known as gingivitis, is reversible with consistent care,” says Grobbelaar. “Left untreated, though, it can develop into periodontitis, a more advanced form that damages the tissues and bone supporting the teeth. This not only threatens your smile but also stirs up inflammation that can ripple throughout the body.”

How inflammation links the mouth and metabolism

Inflammation is the body’s built-in defence mechanism, but when it turns chronic, it becomes harmful instead of helpful. Gum disease drives ongoing inflammation in the mouth, and that inflammatory load can spread through the bloodstream, contributing to wider systemic inflammation.

For people with diabetes, this creates a dangerous cycle. Chronic inflammation reduces the body’s sensitivity to insulin, making blood sugar harder to manage. High blood sugar, in turn, fuels even more inflammation in the gums. Breaking this cycle is key, and it starts with daily oral care and balanced blood sugar control.

Oral health warning signs

People with diabetes are more likely to face specific oral issues, including:

• Dry mouth (xerostomia)
• Tooth decay (cavities)
• Bleeding gums and gum disease
• Persistent bad breath

When blood sugar levels rise, extra glucose in the saliva gives bacteria more fuel to multiply. Around 40% of people with diabetes also experience dry mouth, which reduces saliva’s natural cleansing and protective action. Because saliva helps neutralise acids and wash away debris, a lack of it can accelerate decay and infection.

“On top of that,” adds Grobbelaar, “slower healing and lower resistance to infection can make gum problems tougher to overcome. And since gum disease can worsen blood sugar control, it becomes a self-perpetuating problem, unless you take steps to interrupt it.”

Your dentist: a vital part of your diabetes care team

Managing diabetes isn’t only about medical check-ups, your dentist and oral hygienist are crucial allies in keeping your health in balance. Once diagnosed, schedule a dental visit as soon as possible and share your full medical history, including any medications you are on. Regular professional cleanings (at least twice a year) allow your dental team to remove tartar and detect early warning signs that may not be visible at home.

If your blood sugar levels are unstable, your dentist may recommend postponing certain treatments, like gum or implant surgery, until they’re under better control. Good communication between your dentist and doctor can make a real difference in both your oral and overall health.

Daily routine for a healthier mouth

A strong oral care routine supports not just a healthy smile, but a healthier body too.

1. Brush

• Brush twice a day for two full minutes, reaching along and under the gumline with the GUM Technique PRO – its tapered bristles and ergonomic quad grip helps guide a healthier brushing technique.
• Use a soft-bristled or sonic toothbrush like Oclean X Ultra for gentle, effective cleaning.
• Choose a mild or natural toothpaste, such as Olgani Naturals, to protect sensitive gums.

2. Clean Between Teeth

• Floss or use interdental brushes daily to remove plaque from areas your brush can’t reach.
• If traditional flossing is difficult, try GUM Soft-Picks.
• Ask your oral hygienist which interdentals are best for your needs. 

3. Rinse

• Rinse after meals and before bed with an alcohol-free mouthwash such as GUM, Dentyl Active, Thryve or Olgani.
• Avoid alcohol-based rinses, which can worsen dry mouth.

“Diabetes and gum disease feed off each other through inflammation and infection. But the cycle can be broken with the right care, balancing blood sugar, maintaining meticulous oral hygiene, and working closely with your healthcare team,” concludes Grobbelaar.

Learn more

Visit ivohealth.co.za/diabetes-oral-health for expert advice, product recommendations and practical guides.