Your best bet for any job is to never have any visible piercings save for the ears, and never to have visible tattoos. Although that seems like an immensely conservative standpoint, many companies and managers expect their employees, whether prospective or current, to display a professional appearance. Even if it's within their policy to allow it, your best bet is simply not to. I'm all about freedom of expression and appearance, but if somebody doesn't have the courtesy to remove their facial piercings, then I sometimes have to question their ability to function on a professional level.
Especially don't wear it at your interview. For the love of God, don't. And dress up. Blue-jeans are a no-go. You can never overdress for an interview (unless you choose to wear a wedding-gown), and an employer is going to more quickly hire you if you are taking every minute of that interview seriously.