I used to have mine pierced, only ever wore tiny studs though, but when I started working in a legal office it wasn't suitable anymore so left it out during the day and just ended up not bothering wearing it anymore.
Because of my job I accept that certain things just aren't appropriate at work, visible piercings other than normal earrings, normal hair colouring, no visible tattoos etc...
In a school context, I'd say that if the kids aren't allowed them then the staff shouldn't wear them either as a good example.