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I can't see how you could get any practice this way. After 2-3 shaves 4-7 strokes would bring the edge back. Any more could make things worse rather than better. And if the razor was finished on...

Does the razor feel dull when shaving your cheeks. If so it is.
If dull only when doing the chin. It may be dull &/or it is a technique issue.
You may have stropped the razor dull.
You may have...