Smile

It doesn't appear very often, and when it does it can be just a slight hint--a brief upturn at the corner of the lips.  Rarely do the teeth emerge.   It doesn't come naturally with a greeting; the look can be neutral or even somber.  So when I do see one, even a brief, fleeting glimpse of one, I take note. But it's important that I do things to help coax it out.  A hug can sometimes do it; a congratulations; an excited, positive reaction to a good grade.  So I look for opportunites to help it emerge, with the hopes that, over time, it will come more easily, more naturally.