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I would define an ultra sharp razor as one that literally wipes hairs off your face without any discomfort, and one good test for this is how the razor shaves ATG. It doesn't have to be a full ATG...

A couple thoughts:

-In order to shave ATG with any degree of comfort and little/no irritation your razor MUST be ultra sharp. If you only "think" your razor is sharp enough it probably isn't.
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