Bleeding gums is serious problem which should not be taken for granted. It may signal the start of the destructive process that involves the tissues that support the teeth or may be some serious underlying systemic problems. The cause of gum disease is plaque which is a sticky film of bacteria that constantly forms on the teeth. Toxins are created by bacteria that damages the gums. One can keep their teeth by taking care of your gums. Gingivitis is one common form of gum disease and can affect the tissues that support and surrounds the teeth. The cause of gingivitis is bacterial plaque and can turn into tartar build up and can cause gum irritation and bleeding gums.