Taking good care of your gums helps to prevent cancer. Gum disease is caused by sticky, bacteria-laden plaque that forms on teeth. According to a new study, women with gum disease are 14 percent more likely to develop cancer than those with healthy teeth and gums. The link appears to be strongest for esophageal cancer, but associations were also found between poor oral health and lung, gallbladder, breast, and skin cancer. Daily flossing and brushing can usually reverse gum disease.