Full Mouth Dental Implant Research | Patient Resources

The evidence,
condition by condition

Every claim below is traceable to a published systematic review, meta-analysis or umbrella review.

Strong — large, consistent evidence

Moderate — consistent, with limits

Emerging — early but promising

Strong evidence

Gums & inflammation

Gum disease is one of the most common chronic conditions on earth, affecting more than a billion people. It is a slow, low-grade inflammation of the tissue that holds your teeth — and that same inflammation is the thread connecting the mouth to everything below.

How it’s linked

What you can do

Brush twice a day with fluoride toothpaste, clean between your teeth daily, avoid smoking, and see a dentist or hygienist regularly. Healthy gums are one of the more controllable parts of long-term health.

References

◆ Vijayanarayanan R, Coote et al. (2026). Direct healthcare costs of oral diseases in the UK: a cost-of-illness projection to 2050. Front Public Health, 14:1863227. — 21D Clinical Research

Global Burden of Disease Study 2021 — severe periodontitis burden (>1 billion affected).

Moderate

Brain & memory

Poor gum health and tooth loss are linked to a modestly higher risk of cognitive decline and dementia in later life — roughly 15–20% higher in pooled studies. The evidence is consistent, but it comes from observational research, so cause and effect isn’t settled.

How it’s linked

Long-running inflammation and certain oral bacteria may affect the brain over decades. Losing teeth may also matter indirectly, through changes to diet and nutrition.

What you can do

Keeping your natural teeth and healthy gums is worth prioritising as you age. The habits that protect the mouth are low-risk and may help protect more than your smile.

References

Asher et al. (2022). Periodontal health, cognitive decline and dementia: meta-analysis of longitudinal studies. J Am Geriatr Soc, 70(9):2695–2709.

Li et al. (2023). Tooth loss and risk of cognitive decline and dementia: meta-analysis of cohort studies. Front Neurol, 14:1103052.

Strong

Heart & circulation

People with gum disease have a higher risk of heart disease and stroke. This is an association — the two share inflammation as a common driver — rather than proof that one directly causes the other.

How it’s linked

Oral bacteria and inflammatory signals are thought to contribute to fatty plaques building up inside arteries (atherosclerosis), which narrows them over time. Across dozens of reviews the risk runs roughly 1.2 to 2.9 times higher.

What you can do

Look after your gums alongside the other things that protect your heart — not smoking, staying active, and eating well.

References

◆ Vijayanarayanan R, Coote et al. (2026). Cost-effectiveness of non-surgical periodontal therapy in cardiovascular disease. Cost Eff Resour Alloc, 24:786. — 21D Clinical Research

Arbildo-Vega et al. (2024). Periodontal disease and cardiovascular disease: umbrella review. BMC Oral Health, 24:1308.

American Heart Association scientific statement (2025). Circulation.

Strong

Blood sugar & diabetes

Gum disease and type 2 diabetes feed into each other. High blood sugar makes gum disease worse, and severe gum disease can make blood sugar harder to control — a genuine two-way street.

How it’s linked

Inflammation from the gums appears to interfere with how the body responds to insulin. Encouragingly, treating gum disease produces a small but real improvement in blood-sugar control — around a 0.4% drop in HbA1c in clinical trials.

What you can do

If you have diabetes, treat gum care as part of managing it and keep both your dentist and doctor in the loop. If you don’t, healthy gums are one less thing nudging your risk upward.

References

Simpson et al. (2022). Treatment of periodontal disease for glycaemic control in people with diabetes. Cochrane Database Syst Rev, CD004714.

Baeza et al. (2020). Effect of periodontal treatment in patients with periodontitis and diabetes. J Appl Oral Sci.

Moderate

Kidneys

Gum disease tends to be more common and more severe in people with chronic kidney disease, and the link runs in both directions. Severe gum disease is associated with roughly twice the odds of kidney disease.

How it’s linked

Shared drivers such as diabetes and high blood pressure play a large part, and chronic inflammation from the gums may add extra strain on the kidneys over time.

What you can do

If you have kidney disease, mention it to your dentist and keep up regular gum care. Managing blood pressure and blood sugar protects your kidneys and your gums at the same time.

References

Deschamps-Lenhardt et al. (2019). Association between periodontitis and chronic kidney disease: systematic review and meta-analysis. Oral Dis, 25(2):385–402.

Yang et al. (2024). Meta-analysis of chronic periodontitis and chronic kidney disease. World J Clin Cases, 12(22):5094.

Emerging

Gut & digestion

The mouth and gut are the two busiest microbial communities in the body, and researchers are increasingly mapping how they talk to each other — the “oral–gut axis.” Gum disease is linked to a higher rate of inflammatory bowel conditions, at roughly twice the odds.

How it’s linked

Bacteria swallowed from an unhealthy mouth can survive and settle in the gut, where they may stir up inflammation. This is a fast-moving field and the full picture is still forming.

What you can do

The basics still apply: healthy gums mean fewer harmful bacteria heading downstream. A good oral routine supports your gut as well as your mouth.

References

◆ Vijayanarayanan R, Coote et al. (2026). The oral–gut axis: a systematic review. J Oral Microbiol, 18(1):2705699. — 21D Clinical Research

Zhang et al. (2021). Association between periodontitis and inflammatory bowel disease: meta-analysis. Biomed Res Int, 6692420.

Wang et al. (2024). Bidirectional associations between periodontitis and IBD. J Periodontal Res, 59(6):1083–1094.

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