It fell out yesterday and I am not seeing my dentist till Thursday. Its only a year old and was put in over a bottom back molar that had a previous large filling. I think the stump that is left is mostly filling surrounded by dentine and it is soooo sensitive I cant touch it, clean it eat or drink on it. Should it really be causing this much nerve pain? and can the crown be simply cemented back on as I cant imagine letting my dentist anywhere near it at the moment. Please help. I am really nervous its more serious