Growing scientific evidence suggests that poor oral hygiene may increase the risk of heart disease, stroke, and even cognitive decline. Dentists and medical researchers say gum disease and tooth decay do not only affect the mouth but can also influence the health of the brain and cardiovascular system.
One study found strong evidence linking periodontal disease, tooth loss, and cardiovascular disease. Researchers concluded that periodontitis may act as a risk factor for heart conditions through systemic inflammation, oxidative stress, and changes in oral microbiota.
Another study concluded that untreated gum disease and tooth loss were linked to a higher risk of dementia, while prompt gum treatment appeared to protect cognitive health.
Research also shows that people with both cavities and gum disease had nearly double the risk of stroke, even after accounting for other cardiovascular risk factors. The findings strengthen evidence connecting oral health to broader systemic inflammation.
Dr Daniel Naysan, a leading cosmetic dentist at Bedford Dental Group, said that chronic gum disease is increasingly being recognised as a factor that can affect overall health. “Growing research links chronic gum disease to a higher risk of cardiovascular disease and, potentially, Alzheimer’s,” he explained. “Oral bacteria can enter the bloodstream, where their toxins and DNA have been found in arterial plaques, triggering inflammation that contributes to plaque build-up and instability. These same pathogens, especially Porphyromonas gingivalis, have also been detected in the brains of individuals with Alzheimer’s, where they may promote neuroinflammation and neuronal damage.”
He added that while more research is needed to confirm direct causation, “the evidence strongly suggests that oral pathogens and chronic inflammation can affect the health of distant organs, including the heart and brain”.
Dr Catrise Austin, author of Gum Health Made Simple and host of The Let’s Talk Smiles Podcast, said the mouth is often an early warning system for wider health problems. “Your mouth is the gateway to your body, and inflammation that starts in the gums can travel far beyond your smile,” she said. “When bacteria from gum disease enter the bloodstream, they trigger inflammation in the blood vessels, contributing to plaque buildup, elevated blood pressure, and a greater risk of heart attack or stroke.”
Experts agree that prevention remains the most effective protection. Dr Royce Lai of King Village Dental said that signs such as bleeding gums, bad breath, and loose teeth should never be ignored. “Poor oral hygiene and gum disease lead to inflammatory issues elsewhere in the body,” he said. “Although brushing twice a day, flossing, and seeing your dentist regularly may seem too simple, it is the most effective form of preventive care. Having good oral hygiene is about more than the smile on your face. It helps prevent heart and brain disease.”
