Can Brushing Your Teeth Really Prevent Cancer? Experts Say Yes!

When you think about brushing your teeth, you probably imagine fresh breath, cavity prevention, or a bright smile. But did you know that a simple toothbrush may help you fight against cancer? Yes, you read that right. Recent studies and expert opinions are pointing toward a surprising health truth: good oral hygiene could significantly lower your risk of certain types of cancer, including those of the mouth, neck, and even the digestive tract.

"Poor oral hygiene doesn't just affect your gums and teeth—it can fuel chronic inflammation in your body," says Dr Rajesh Koppikar, Consultant, Dental Surgery, Kokilaben Dhirubhai Ambani Hospital, Mumbai. “Chronic gum infections like periodontitis can increase systemic inflammation, which is a known risk factor for cancer.”

In fact, a 2020 study published in Cancer Epidemiology, Biomarkers & Prevention found that individuals with severe periodontal disease were twice as likely to develop certain cancers, including pancreatic and oral cancers.

This link isn't entirely new. Western researchers have been studying the mouth-body connection for years. Dr Nigel Carter, CEO of the UK-based Oral Health Foundation, says, “The mouth is the gateway to the body. If harmful bacteria can enter the bloodstream through bleeding gums, they can travel to organs and increase the risk of systemic diseases, including cancer.”

Inflammation is your body’s way of fighting off infection. But when inflammation becomes chronic—often due to poor oral health—it creates the perfect storm for abnormal cells to grow and multiply.

“Chronic gum disease doesn’t just cause tooth loss—it also creates an environment that weakens the immune system,” explains Dr. Koppikar. “That’s when conditions like oral and pancreatic cancers find a chance to thrive.”

Another concerning factor is the human papillomavirus (HPV), a common sexually transmitted virus. "HPV can infect the mouth and throat and has been linked to a rise in oropharyngeal cancers," says Dr. Rachel B. Rodin, a clinical researcher in infectious diseases at the Public Health Agency of Canada. Poor oral hygiene can increase the risk by compromising the mouth's natural defences.

Cancer patients undergoing chemotherapy or radiation often experience dry mouth, ulcers, and increased susceptibility to infection. "In such cases, maintaining good oral hygiene isn't just important—it's critical," adds Dr Koppikar. “Oral infections can delay treatment recovery or even lead to hospital readmissions.”

Everyday Habits That Help

So, how exactly can a toothbrush help prevent cancer? The answer lies in daily habits that keep your mouth free from harmful bacteria. This includes brushing twice a day with fluoride toothpaste, using dental floss or water flossers, and rinsing with an antibacterial mouthwash.

“Oral hygiene is like preventive medicine you can do at home,” says Dr Tim Newton, Professor of Psychology as Applied to Dentistry at King’s College London. “And it’s low cost!”

Dr Koppikar also recommends regular dental check-ups—especially for those at higher cancer risk due to smoking, alcohol use, or a family history of cancer. “These groups need to be extra cautious, not just about their lungs or liver, but also their mouth,” he says.

Aside from brushing and flossing, simple lifestyle changes can dramatically improve your oral (and overall) health. “Avoid tobacco, limit alcohol, stay hydrated, and eat a balanced diet rich in fruits and vegetables,” advises Dr Koppikar.

While brushing your teeth may not be the only way to prevent cancer, it’s a habit that may help keep your health in check.

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