Ack, I just realized I hadn't updated this in a while!!
Well, Mr. H. was cranky for a few days (understandably) when his tooth fell out, but he's back to being his sweet laprat self. He did an amazing job of keeping his lower teeth whittled down - his upper tooth got a little short, but not too short. He certainly enjoyed getting tons and tons of Ensure and baby cereal! I'm reintroducing him to lab blocks now, as his tooth was grown back!
Looks like it's perfectly straight, and he's happy - he's with his girls, who dote on him (and really adore having the extra yummies like ensure-laced baby food!).