The ductus arteriosus is a hole that allows the blood to skip the circulation to the lungs. However, when the baby is born, the blood must receive oxygen in the lungs and this hole is supposed to close. If the ductus arteriosus is still open (or patent) the blood may skip this necessary step of circulation. The open hole is called the patent ductus arteriosus.
Caring for a Bleeding Tooth. Some people mistakenly think that while brushing, a bleeding tooth is perfectly normal. It is not. Anytime there is any bleeding in the mouth, it is almost always a sign of periodontal disease. Even if you brush fairly hard, it should not cause healthy teeth and gums to bleed.
Most people don't realize this, but your gums are not supposed to bleed when you brush and floss. If yours do, you probably have gum disease â or are at least well on your way. Gingivitis, the milder form of gum disease, makes gums red, swollen, and quick-to-bleed â part of a response to the bacteria in the plaque that builds up between your teeth and gums. More than half of Americans have gingivitis.