I had a crown come off and it was held in place with a post. The dentist tried to dig the post out but could not. He said it would need the post to stay in. So he glued it back in and said that it would not stay in very long. Where can I get some sort of dental glue to put it back in every few weeks. I need to make it last until January. I have used up my yearly quota for my dental insurance for this year. What he wants to do is make a double crown so the other crown will support the other. "$1400". insurance will pay $1000 if I wait until January. Note: I asked one time if he has to work on a tooth that was super glued in, He said yes, and the glue is toxic and causes major problems to the existing base.