I dated a guy once that had a tongue ring. I guess he didn't use the Listerine enough...but when he took ou the bar, the underside of his tongue had turned green. NASTY!
I mentioned getting my tongue pierced once to my mom. I was in my MID-20S. She swore that I had the devil in me and that I might as well be one of those people on Maury Povich. Didn't get my tongue pierced but it did give me a good laugh.
Good luck with your daughter. She's just trying to find out who she is. I know it must be hard for you especially being in Iraq but you'll be home soon and then you can straighten her out.