Poor oral hygiene can lead to gum disease, resulting in bacteria and plaque buildup . One type of bacteria in particular, Helicobacter pylori , is responsible for causing stomach ulcers. This type of bacteria is more present in people with gum disease, increasing their risk for stomach ulcers. Chronic inflammation from gum disease is associated with heart disease . Studies show that up to 91% of patients with heart disease have gum disease too.