i have got a white spot and swelling behind my front teeth . it is realy painful . i do have crowns on my front teeth and i have noticed  that they are going black where they go into roof of mouth . teeth are bleeding when i brush them . also have bad taste in my mouth. been like this for a month .dont feel well and very tired . what can it be.
Hello and welcome to Chat Doctor forum, Usually, oral hygiene maintenance is very important regarding the crown placed tooth, since chances of plaque getting accumulated is high in such cases. The gums of tooth have inflamed resulting in abscess formation. Black discoloration of crown may be due to stains occurred on it. I would suggest you to get a thorough scaling and root planning done. The pus has to be Chat Doctor. Use soft interdental toothbrush to clean your teeth. Rinse your mouth after every meal. To improve gum health, iron , vitamin-c rich foods has to be taken. Take care.