I had a crown done about a few months ago from what I hear crown are suppost to last up to 10 years 4 months later the crown lifted off the bottom of the root canal I had done. Thankfully not eating anything or could have swallowed it and choked since I have never seen nor heard till doing work online about this. Still planing to go back and if they would like to offer it as a free attachment or replacing back on I would be happy other wise I will be looking for another dental practitioner