If the crowns have loosened 3 times in 3 weeks, wither new crowns need to be made or the teeth need to be extracted and dental implants place. It seems as though there maybe not be enough tooth left to make a ling lasting crown. It is also possible that you are grinding on your front...
Placing the new crown should not be more than 10 days max. In some cases we had to deliver the final permanent crown the next day, which is very possible. Of course the ceramists usually charge an extra rush charge depending on the complexity of fabricating the permanent crown! Usually less t...
While it is unfortunate that the crown broke, it is not likely that fault lies with the dentist. There are so many factors involved that "blame" is hard to apply. Finding a new dentist is up to you, but if trust is broken then perhaps you should move on.