What are these "dental trays" people speak of? My husband has had most of his jawbone removed and all but 2 teeth removed on his lower jaw. He completed Erbitux in Jan. and we have a consult with a dentist who deals with prothesis'. I am not sure what to ask him as far as questions on what can be done in his case. I realize everyone's case is unique but for anyone who has dealt with this; anybody have ideas?