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Go back and ready my first post. There is no need to ever turn a blade over. There is only one edge. If you feel better doing it, then do it.

OK, no problem. I personally "switch edges" when I go from the right side of my face to the left side on each pass. This gives each side equal usage. There are many ways to skin this cat.

The numbers are for manufacturing purposes only.

A double edge razor blade is just that, "double edged". There are only two edges, not four. Each opposite side of the blade has an edge. There is...