So I wiped out this morning - my fault, I tried to get onto the sidewalk from a driveway going diagonally and I did it way too fast (the roads were a bit slick). The bike slipped out from under me leaving my cheek and helmet on the asphalt.
The helmet may have done it's job, but I'm not 100% sure how much of the impact it took. It's got a few scratches on the front bottom-right corner so it looks more like it took a glancing blow (whereas my cheekbone didn't fare as well). Does it need to be replaced?