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.
Everyone's gums bleed at some point in their lives for a variety of reasons, but the sight of a little red while you brush can still be unnerving. Gums, or gingiva, are the pink tissue that cover your jawbone and hold your teeth in place. Healthy gums are firm, taut and surround each tooth. Of course, there are multiple reasons why your gums may start leaking red, and none of them are comfortable. To help make sure your gums are as healthy as possible, we're going to list five of the leading reasons why gums bleed and what you can do to remedy the situation. First, we'll talk about the most common cause of bloody gums, but luckily, it's the easiest to fix!