Thank you for your inquiry. An endodontist typically will only treat a root canal and place a temporary filling. You will then go back to your general dentist to have a permanent filling placed and prep for a crown. A temporary crown will be placed initially and then you'll have a subsequent ...
It seems that the endodontist means leakage of mercury from amalgam. This is not evidence based, meaning that no scientific evidence exists to prove that amalgam causes health effects. In addition, amalgam leakage is not something that may show in x-rays. Seek a second opinion about the...
If the tooth underneath is not damaged and does not have recurrent decay, it is possible for the crown to be put back on. It does sound like your tooth may have some recurrent decay, and in that case you will need an x-ray and exam to see what can be done. I would have it looked at fairly quickly.