It's just something I've noticed more lately, how some of my friends and relatives and their kids smile with their mouths shut (not showing their teeth). Or maybe it's just more for pictures/ staged pictures? I'm curious to check out my kids' yearbooks now, to see what ratio smiles with their teeth showing, or not. I don't have the prettiest teeth (especially the last few years), and I'm kind of embarassed/ self-conscious of them, but it's just more natural for me to smile with them showing.
How about you and your loved ones?