Rezdog is right. There are many variables. For one you may have set the bevel wrong and the edge was too fine so it rolled or bent under pressure. Facial hair is very different from arm hair. Lay the edge flat on your thumb nail and pull it across. Does the edge flex? As far as testing sharpness. My wife has very fine hair. I use a hair from her hair brush for a hht. Not foolproof bet better than arm hair.