Approximately 8 or 9 years ago my brother met with an accident on which a wall fall upon him and the first two teeth in the upper jaw move under the mouth or you can say bend inward after that he stand up quickly and after that he put tooth to  origional position after that he met with many doctors day suggested RCT he has gone with that and recently he noticed swelling in his mouth in the upper section and on pressing them yesterday he noticed pus coming from the tooth what could be the reason and what should be the treatment for this. And one more thing is that gums around the tooth are slightly black in colour