Dementia and oral health: what dental teams need to know
Dental teams increasingly treat patients with dementia. Understanding the oral-cognitive link helps identify at-risk patients and improve care protocols.
Dementia affects around 900,000 people in the UK, projected to rise above 1.6 million as the population ages. Oral health is often overlooked in this vulnerable group, yet dental professionals can play an important role in preserving comfort, dignity and quality of life. The relationship between dementia and oral health is bidirectional: dementia impairs self-care and increases oral disease risk, while periodontal disease may contribute to cognitive decline.
How dementia affects oral health
Dementia encompasses over 100 types of cognitive disease, including Alzheimer's disease, vascular dementia, frontotemporal dementia and Lewy body dementia. As the condition progresses, patients struggle with daily oral care, experience reduced manual dexterity and may resist treatment due to confusion or anxiety. Common oral challenges include poor plaque control, increased risk of dental caries (particularly root caries), periodontal disease, xerostomia, ill-fitting dentures, oral infections and undiagnosed pain. Communication difficulties mean discomfort often goes unreported. Changes in diet toward softer, carbohydrate-rich foods further increase disease risk. In later stages, patients may experience dysphagia (swallowing difficulties), with risks of food pocketing, choking and aspiration into the lungs.
The link between periodontal disease and dementia
Research shows a bidirectional relationship between oral health and cognitive decline. The bacterium Porphyromonas Gingivalis, found in the brains of Alzheimer's patients, can enter the bloodstream through inflamed periodontal pockets and travel to the brain via systemic pathways or peripheral nerve pathways. Once there, it may trigger inflammation and damage to brain cells. Chronic periodontal inflammation can trigger systemic inflammatory responses that affect the brain. Toxins produced by oral bacteria may promote accumulation of amyloid plaques, a hallmark of Alzheimer's disease. Meta-analysis data show that patients with moderate or severe periodontitis face greater risk of developing dementia, and those with infections were twice as likely to develop dementia compared to those without infections.
Supporting oral care in dementia
Dental professionals must adapt care for patients with dementia, recognising challenges such as difficulty brushing, increased appetite fluctuation and xerostomia from medications. Later-stage dementia may render patients non-verbal, making pain communication impossible; non-verbal indicators of discomfort include facial grimacing, agitation, aggression, restlessness and refusal to eat. Healthcare settings now use non-verbal pain assessment tools to identify discomfort. Empowering carers, often family members, with knowledge and confidence to support daily oral care is essential. An integrated healthcare model embedding oral health within dementia care pathways can ensure better outcomes for this growing population.
Frequently asked questions
How many people in the UK have dementia?
Around 900,000 people currently live with dementia in the UK, with projections showing this will rise to over 1.6 million as the population ages.
What oral bacteria found in Alzheimer's patients can affect the brain?
Porphyromonas Gingivalis, a bacterium associated with periodontal disease, has been found in the brains of Alzheimer's patients. It can enter the bloodstream through inflamed gum pockets and travel to the brain, potentially triggering inflammation and brain cell damage.
Does periodontal disease increase dementia risk?
Meta-analysis data indicate that periodontitis is associated with cognitive impairment, and patients with moderate or severe periodontitis are at greater risk of developing dementia. However, whether periodontal disease is a direct cause is still uncertain.
What are common oral health challenges in dementia patients?
Challenges include poor plaque control, increased dental caries (especially root caries), periodontal disease, xerostomia (dry mouth), ill-fitting dentures, oral infections, swallowing difficulties and undiagnosed pain. Communication problems mean discomfort often goes unreported.
How should dental teams adapt care for dementia patients?
Dental professionals should use compassionate approaches, employ non-verbal pain assessment tools for advanced dementia, empower carers with oral care knowledge, address medication-related xerostomia, and integrate oral health into broader dementia care pathways within the healthcare system.
