The link between gum and heart problems has long been recognised but it is unclear if poor oral health is simply a marker of a person's general wellbeing.
UK and Irish experts now say bacteria enter the bloodstream via sore gums and deposit a clot-forming protein.
The findings are being presented at a meeting of the Society for General Microbiology.
Earlier this year a Scottish study of more than 11,000 people found people who did not brush their teeth twice a day were at increased risk of heart disease.



