I think we can all agree the author should not write a tooth getting cracked on the piercing, because that's a direct DNW violation. However, a tongue piercing on its own doesn't violate the DNW at all. This is like saying if someone DNWs tooth harm, then the author should never ever write their characters in a fistfight, or falling off a horse/tree/staircase, or any number of other things that could cause trauma to teeth (and honestly would be more likely to than a tongue piercing, come on).
Re: Last-minute panic question
I think we can all agree the author should not write a tooth getting cracked on the piercing, because that's a direct DNW violation. However, a tongue piercing on its own doesn't violate the DNW at all. This is like saying if someone DNWs tooth harm, then the author should never ever write their characters in a fistfight, or falling off a horse/tree/staircase, or any number of other things that could cause trauma to teeth (and honestly would be more likely to than a tongue piercing, come on).