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.
#1 Tasting blood. The first and most obvious sign that shows your blood clot has become dislodged from the tooth socket is the presence of fresh blood. This usually occurs within the first few hours or first few days after a tooth extraction. If you see blood whenever you spit out saliva, it is a pretty strong indication that the blood clot has fallen out of the tooth socket. It isnât necessarily a bad thing if you taste blood.