Poor oral health may accelerate dementia progression, experts warn

It may sound surprising, but a growing body of scientific evidence suggests that what happens inside the mouth may have consequences far beyond teeth and gums. Researchers are increasingly exploring whether poor oral health—particularly untreated periodontal disease—could influence the development or progression of dementia, one of the world’s fastest-growing public health challenges. At the same time, dementia itself creates major barriers to maintaining good oral hygiene, creating what experts describe as a two-way relationship that can progressively worsen both conditions if left unaddressed. As populations continue to age worldwide, dental professionals are being urged to play a much greater role in identifying oral disease early, supporting caregivers and helping preserve quality of life for people living with cognitive impairment. Why the mouth and brain may be more closely connected than once believed Scientists have long recognised that chronic inflammation contributes to numerous systemic diseases, including cardiovascular disease and diabetes. Now, researchers are examining whether chronic oral inflammation—particularly that caused by periodontal disease—may also affect the brain. Several studies have detected Porphyromonas gingivalis, one of the principal bacteria involved in advanced gum disease, in the brains of patients with Alzheimer’s disease. Although researchers have not established that this bacterium directly causes dementia, its presence has intensified scientific interest in understanding how oral bacteria and chronic inflammation may influence neurodegenerative disease. Scientists believe bacteria or their inflammatory by-products may enter the bloodstream through diseased gums and potentially reach the brain, where persistent inflammation could contribute to the processes associated with cognitive decline. Experts stress that this remains an active area of research, but the accumulating evidence continues to strengthen interest in oral health as a potentially modifiable factor in brain health. The relationship works in both directions While researchers investigate whether periodontal disease may influence dementia risk, there is already strong clinical evidence showing that dementia makes maintaining oral health significantly more difficult. As memory, judgement and motor skills decline, many people gradually lose the ability to perform everyday oral hygiene tasks independently. Simple routines such as brushing teeth, cleaning dentures or recognising oral pain can become increasingly challenging. Patients may forget when to brush, become confused about how to use a toothbrush, struggle with reduced hand coordination or resist oral care because of anxiety or communication difficulties. These challenges often lead to rapid deterioration in oral health, increasing the likelihood of untreated tooth decay, gum disease, oral infections, tooth loss and persistent pain. Many dental problems remain hidden until they become severe One of the greatest challenges for patients with dementia is that oral disease frequently develops silently. Unlike an obvious injury, periodontal disease may progress for months or years with few noticeable symptoms until significant damage has already occurred. Similarly, root caries, dry mouth, fungal infections, poorly fitting dentures and oral ulcers may go unnoticed because patients are unable to describe discomfort or may no longer recognise pain. In advanced dementia, oral pain may instead appear as agitation, aggression, refusal to eat, disturbed sleep or resistance during daily care—symptoms that can easily be mistaken for behavioural changes rather than dental disease. This makes regular dental examinations increasingly important throughout the course of dementia. Nutrition often suffers as oral health declines Poor oral health can quickly affect far more than the mouth. Difficulty chewing, swallowing problems, loose teeth, painful gums and ill-fitting dentures frequently reduce food intake and contribute to malnutrition. Many people with dementia also develop altered taste preferences, often craving sweeter or softer foods that further increase the risk of tooth decay. Medication-related dry mouth adds another layer of complexity by reducing saliva’s natural protective effects, allowing harmful bacteria to multiply more easily while increasing susceptibility to cavities and oral fungal infections. These combined factors may create a cycle in which declining oral health worsens nutrition, while poor nutrition further compromises overall health. What research says about periodontal disease and dementia Although researchers caution that current evidence does not prove periodontal disease directly causes dementia, several systematic reviews and meta-analyses suggest people with moderate to severe periodontitis appear more likely to develop cognitive impairment than those with healthier gums. Researchers believe chronic inflammation may represent one of the biological pathways connecting the two conditions. Other investigations have reported higher rates of dementia among individuals with a history of serious infections, further reinforcing interest in the potential role of systemic inflammation in neurodegenerative disease. Scientists emphasise that additional long-term clinical research is still needed to clarify the exact relationship and determine whether improving oral health could reduce dementia risk or slow disease progression. Dental professionals have an increasingly important role Experts say dentistry should become an integral component of dementia care rather than an afterthought. Early preventive care before cognitive decline becomes severe offers the greatest opportunity to maintain oral health and reduce future complications. Dental teams are also encouraged to educate family members and caregivers about practical strategies that can make daily oral care easier, including simplified brushing routines, softer toothbrushes, appropriate fluoride products, adequate hydration and regular professional assessments. Recognising non-verbal signs of oral pain is equally important in patients who can no longer communicate discomfort effectively. Why integrated healthcare matters As dementia cases continue rising globally, healthcare professionals increasingly argue that oral health should be incorporated into routine dementia management alongside medical, nursing and social care. An integrated approach could help reduce preventable pain, preserve nutrition, lower infection risk and improve quality of life for millions of older adults. The growing evidence also reinforces an important message for the wider public: maintaining healthy gums and teeth throughout life may benefit far more than a person’s smile. While scientists continue investigating exactly how the mouth and brain interact, experts agree on one point—good oral hygiene remains one of the simplest, safest and most important investments people can make for their long-term health. Stay informed, stay alert! pk/06-Jul-2026/poor-oral-health-may-accelerate-dementia-progression” target=”_blank” rel=”nofollow noopener noreferrer”>Read full story on Dental News