People with swollen gums, missing teeth and other signs of poor dental health are more likely to be infected orally with the human papillomavirus, researchers reported on Wednesday. HPV, a sexually transmitted virus, causes cancers of the cervix, mouth and throat. The new study, published in Cancer Prevention Research, is the first to document a link between the infection and poor oral health, but other experts noted that the research found only an association and relied mostly on self-reported data about oral health. It is too early to say with confidence that brushing and flossing regularly can prevent oral HPV infection, they said. Dr. Maura L. Gillison, a professor of medicine at Ohio State University, who was not involved in the study, is quoted.