While doing a root canal, the endodontist broke the crown through which he was drilling. When the Novocaine wore off, I realized that I had no more tooth (#19). When I called him, the office staff told me that I would need to go to my dentist and have another crown made. I wasn't told by the endodontist that #20 was sharp and would be scraping my tongue, nor did he tell me that I would need a crown. ( I was still numb when I left the chair). I called my dentist and was told that a new crown would cost at least $500. Does the endodontist have any responsibility for breaking the crown?