My sister got her tongue pierced when she was 18, I was 10. When the swelling finally went down, it looked awesome. I spent the next 6-7 years wanting one. Once I turned 18 my BF had convinced me to not get it done, because it's pretty hard to get a job if you have any kind of piercing in your face. Oh, and aside from the whole tooth chipping and how they effect your gums, sometimes the balls can twist off and you'll end up swallowing them. I think my sister went through 10+, I can't remember how long she had it in for.

I've heard that eyebrows hurt the worst, and nose piercings get pretty icky. Overall, if you plan on getting a job, don't get a piercing anywhere on your face other than ears. If you just want to go to college and have fun, do what you want... But after you've spent alot of time thinking about it.