I had a root canal done on my upper left second molar two years ago. This tooth was originally crowned. The dentist had drilled through the crown to have the job done. Nine months after the root canal, my crown chipped. The tooth did not bother me at all so I decided not to get a crown replacement. Five months ago, it chipped again while I was eating something sticky. Just yesterday, it chipped again with no apparent reason. I think the canal procedure had weakened the crown. There is no pain and the tooth is not bothering me at all. Do I need to get a new crown? I was told that a new crown would cost $800. Please advise me!