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Yes, shaving will wear the edge of the blade. It's very thin. A worn blade will appear ragged when viewed at 10-20X magnification. You can also spot the ragged spots by eye if you shine a strong...

A 6/8 has a noticeably heavier blade, that will probably help cut through multi-trunked whiskers. A 1/4 hollow 5/8 may also have just as much momentum, and be easier to use if you have a medium...