Bed of Nails

This actually makes me want to cry:

And I know it's stupid, they're just nails, but this boy has had the. most. beautiful. nails you could imagine.  I mean they were gorgeous - gorgeous size, gorgeous shape, just perfect - and I told him that every time I had to cut them, which was a lot, cos they grew fast (but I was in awe of them).  And perfect nails are hard to come by in this family, due to weird nail genetics of those that don't bite them (ask Toots to show you her thumb!) and well, because of biting for those that do, so having gorgeous nails is not something to be sniffed at.

But ever since school started back after summer he's been picking them.  First his thumbs, then his left hand, and now every nail on both hand.  Picking, and picking, and picking.  And as a person that still struggles with biting her nails and knows how easily a habit can start, and now has horrible tiny little nails that can never grow long again and will always be weak, I have begged and begged and begged him to stop.  Today I finally resorted to Stop'n Grow, which won't be as effective as if he bites his nails, but maybe? will transfer on to his fingers enough to be horrible.  Maybe? 

Any other solutions out there??