The piercing must be done with a surgical steel bar, which would be highly detectable to your employers. It has to stay in for 6 weeks to allow the piercing to stabilize, so within that 6 weeks your piercing is sure to be noticed. However, after the 6 weeks you are able to put in a retainer. That 6 weeks of having to have the steel one is what will get you.
Your best bet is to not get the piercing. If you love and need your job, you should not let a piercing get in the way of that. I love piercings, but they are not necessary. Having a job and making money is necessary.
Good luck!
