To dream of a razor, portends disagreements and contentions over troubles.
To cut yourself with one, denotes that you will be unlucky in some deal which you are about to make.
A broken or rusty one, brings unavoidable distress.
To see or use a razor blade in your dream symbolizes precision and accuracy in what you do.
To find a razor blade in your food refers to some cutting remark that you made and is coming back to haunt you.