I havent run into any issues yet with my tongue bar, although I have had it for going on 14 years ( MY GOD! I just realized that makes me old.. ) , although I do remember using some ice drops my 4th day after having my tongue pierced, I dripped it just right the drop of breath freshener hit the top ball and rolled down the bar and off the bottom ball under my tongue...
...yeah, that was a weird feeling.