While there are studies that link gum disease with heart disease, they’re not really clear on the relationship. One may cause the other. One may be a symptom of the other. But, the link is clear so if you have gum disease get it treated. If you have bleeding or sore gums, get ye to your dentist! Better yet, get regular checkups so your dentist can examine your gums for any signs of trouble while small (before it develops into a big problem that will cost a lot more to treat). If you have gum disease, it’s probably a good idea to go to your medical doctor and have them check for heart disease.
There are plenty of resources for dietary guidelines for heart disease, but gum disease isn’t addressed so much. An Eating Well website article looks at the benefits of green tea for both heart disease and for gum disease.