system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: My electric shaver advertises blades that are supposedly "self sharpening". How can blades that are continually used without maintenance sharpen themselves?

Will the blades in my electric shaver ever dull if they are self sharpening?

Or is it just false/misleading advertising?
gpt
Electric razor blades function more like scissors than a straight edge or safety razor.

In a self-sharpening razor, blade elements are designed such that as they wear down through friction against one another, the edges of the elements that meet each other (the parts that actually shear your whiskers) retain edge angles that are sharp enough  to slice your whiskers.

It's a bit like rubbing a block of wood over sand paper, except the block of wood is one blade element and the sand paper is the other.  The sand paper wears down the block of wood, but the edge where the block meets the sand paper is still a perfectly sharp right angle. Now imagine the sand paper has holes in it through which your whisker can enter. As the block's sharp edge moves across the hole, it pinches the whisker and shears it off.