| charlotte gave you some wonderful advice!
The only thing I might add is, make sure you stick with surgical steel jewelry. Surgical steel is the jewelry that was put in when you got it pierced. It has a low rate of allergic reaction, and if it hasnt given you any problems thus far, i'd stick with it. Stay away from jewelry that contains nickel, it has a very high rate of allergic reaction. I would also steer clear of jewelry with plastic bars. Plastic is porous, and can absorb bacteria. You can, however, get a surgical steel bar with plastic balls. That is okay, and is actually recommended to lower the chance of chipped teeth and wearing down of the tooth enamel.
Good luck! If you cant get the balls off yourself, stop trying. Sometimes the piercers put it on too tight and it is very hard to get off. If that is the case, go back to your piercer and have him/her get it off for you. They will usually do this as a courtesy, free of charge. Even if they try to charge you for it, its worth it. | 
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