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.
Sinus toothache. Toothache refers to ache or pain that occurs in or /and around the teeth. The main cause is tooth decay. And pain that you feel is usually as a result of when the dental pulp (the innermost layer of your tooth) becomes inflamed. The dental pulp hosts sensitive nerves and blood vessels.