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Do You Know? For patients. The mouth hosts one of the most diverse communities of bacteria in the body, second only to the gut. Researchers are now studying how the two are connected. What research suggests* We swallow large amounts of saliva every day, and some oral bacteria can reach and settle in the gut. * Some oral bacteria have been found in higher numbers in people with certain gut conditions, such as inflammatory bowel disease. * Much of this research is recent and co

Do You Know? For patients. Studies of elite athletes have repeatedly found poor oral health, despite their focus on fitness. Regular gym-goers share many of the same risks. Where the risks come from* Sports and energy drinks sipped through a workout keep teeth bathed in acid and sugar. * Breathing through the mouth during hard exercise dries the mouth, and saliva is the main protection teeth have. * Clenching during heavy lifts puts high forces on teeth and can chip edges or

Do You Know? For patients. Breathing through the mouth most of the time, often because of large tonsils or adenoids, changes how the tongue, lips and jaw sit at rest. Why it matters* Tooth position depends largely on the resting pressure of the tongue and lips. When the mouth stays open, that balance changes. * In growing children, persistent mouth breathing has been linked to a narrow upper jaw, crowded teeth and changes in the direction of jaw growth. * When enlarged adenoi

Do You Know? For patients. Teeth are not only for chewing. They keep a record of how you grew and how you live. What teeth record* Growth lines: enamel and dentine are laid down in tiny daily and weekly layers, a little like tree rings. * Birth: a distinct line, called the neonatal line, marks the moment of birth in the teeth that were forming at that time. * Childhood illness and nutrition can leave visible bands in enamel that formed during that period. * Diet and habits: a

Do You Know? For patients. Today's fillings replace lost tooth structure with man-made materials. Research is moving towards treatments that help the tooth repair itself. What is already used* Bioactive calcium silicate materials are already used to protect the nerve of a tooth and encourage it to lay down a new layer of dentine. * Keeping part of the nerve alive (vital pulp therapy) is now an established option in selected teeth. What is still in research* Using the tooth's

Do You Know? For patients. Saliva does far more than keep your mouth wet. What saliva does* Washes away food and neutralises acid after eating and drinking. * Supplies calcium and phosphate that help repair early enamel damage. * Contains antibodies and enzymes that control bacteria. * Helps you taste, chew, swallow and speak. A window on healthSaliva carries many of the same markers found in blood. Researchers are developing saliva tests for conditions such as cancers and in

Do You Know? For patients. Vitamin D is known for helping the body absorb calcium. Its role in the mouth reaches further, but the evidence is still developing. What we know* Vitamin D helps the gums' defences: it supports the protective lining and the production of natural antibacterial substances. * Low vitamin D has been linked with gum disease and decay in observational studies, but these links may partly reflect other health and lifestyle factors. * A 2026 review of trial

Do You Know? For patients. Your teeth sit where they do because of a balance of gentle, constant forces from the tongue on the inside and the lips and cheeks on the outside. How it works* The resting pressure of the tongue and lips, held for hours each day, matters more than the brief forces of chewing or swallowing. * Habits that change that balance, such as a low tongue posture, mouth breathing, thumb sucking or lip biting, can move teeth over time. * This is also why teeth

Do You Know? For patients. During deep sleep, the brain clears waste products more efficiently. Researchers call this the glymphatic system. What the research shows* In a landmark study in mice, sleep increased the space between brain cells by about 60%, speeding up the removal of waste such as beta-amyloid. * Studies in people are still developing, but they point the same way: good, unbroken sleep matters for the brain. Where the mouth comes in* Snoring, mouth breathing and

Do You Know? For patients. When someone struggles to keep up with brushing, the cause is often not carelessness. Mental health conditions affect energy, routine and even saliva. What studies show* In adults, depression is associated with a higher chance of tooth decay, and tooth loss is associated with a higher chance of depression, suggesting a two-way cycle. * Children with ADHD have higher rates of decay than their peers. * Some medicines used for depression and ADHD reduc

Do You Know? For patients. Looking after your gums and keeping your teeth may do more than protect your smile. Large studies that followed people for years have linked gum disease and tooth loss with a higher chance of memory problems later in life. What the research shows* A review of 47 long-term studies found that poor gum health was linked with a higher risk of cognitive decline (about 23% higher) and of dementia (about 21% higher). * A review of 18 studies with over 350,

Do You Know? For patients. Your daily routine at work shapes your teeth more than you might think. Some jobs expose teeth to acid or sugar; others bring long hours, stress and snacking. Examples* Swimmers, swimming coaches and lifeguards: studies of competitive swimmers found tooth erosion in more than a quarter of them, linked to hours spent in pool water whose chemistry was not balanced for teeth. * Bakery, sweet-shop and food workers: frequent tasting and easy access to sw

Do You Know? For patients. Some people cannot stop chewing ice. It feels like a harmless habit, but a strong, persistent craving for ice has a medical name, pagophagia, and it can be a sign of low iron. What the research shows* Craving and eating non-food items (pica), including ice, is reported by about 40 to 50% of people with iron deficiency. * In one study of men with iron-deficiency anaemia, about a third craved ice, and the craving went away once their iron was replaced