Yes, bleeding gums is a serious problem. It is either indicating the beginning of the destructive process involving the supporting tissue around the tooth or some serious underlying systemic problems. Gum disease is caused by plaque, a sticky film of bacteria that constantly forms on the teeth. These bacteria create toxins that damage the gums. However, persistent gum bleeding may be due to serious medical conditions such as leukemia and bleeding and platelet disorders. Bleeding gums are mainly due to inadequate plaque removal from the teeth at the gum line. This will lead to a condition called gingivitis, or inflamed gums. It is important to follow the instructions from your dentist in order to maintain healthy gums. Improper brushing and flossing technique may actually irritate or traumatize the gum tissue.