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.
Leave this field blank. Keyword Tags: pregnancy teeth X-Rays pregnancy safety. Like every other body system during pregnancy, the mouth and teeth are affected by the changes in body hormones. Progesterone, specifically, can cause the gums to bleed when brushing and swell during the final trimester of the pregnancy. Increased saliva can also wreak havoc on the gums and protective coating of the teeth during pregnancy.