Dental bridge fell off and my teeth/gums is bleeding

This is the second time my bridge fell off. The first procedure happened 7 yrs ago. Last May it fell off. I kept my bridge and had my dentist place it back. Before that, I noticed that there is occasional bleeding in the area without pain. The first time it fell off, there was no bleeding but when I brush it, that is where the bleeding starts with no pain. When it was put back, I noticed that the cement in the bridge was not taken out. Instead, another cement/adhesive was placed in it.