Is gum disease is linked directly to heart disease?

Probably.: According to the american academy of periodontology, people with periodontal disease are almost twice as likely to have coronary artery disease (also called heart disease). And one study found that the presence of common problems in the mouth, including gum disease (gingivitis), cavities, and missing teeth, were as good at predicting heart disease as cholesterol levels. So brush ; use dental floss.

Definitely can be: Gum disease can contribute to infection in and around the gums, which can spread into the blood stream. This can lead directly to heart issues.

Increased risk: "bad teeth", whether you mean tooth decay and/or gum disease is caused by bacteria. Unlike short term infections, like a cold, when you have gum disease your exposure to these bacteria is long term (several years). This can lead to an increase risk of both heart disease and stroke.

Of course: A growing number of research finds that bacteria, plaque and inflammation (gum disease) in your mouth are linked to heart disease and stroke. See your dentist, it may actually save your life.