That can be true if you had it done with a rusty nail in a back alley by a herion addicted...
It could cause a blood infection and possibly lock-jaw, being the paralisys
As long as you keep infections clean and don't mess about with them theres not a problem.
About the teeth to, that only happens if you rub the bar across your teeth constantly, try to have it as far back as possibly and it should not mess your teeth up at all. The Bar might hit your teeth while talking but it'll happen slowly.
It could cause a blood infection and possibly lock-jaw, being the paralisys
As long as you keep infections clean and don't mess about with them theres not a problem.
About the teeth to, that only happens if you rub the bar across your teeth constantly, try to have it as far back as possibly and it should not mess your teeth up at all. The Bar might hit your teeth while talking but it'll happen slowly.