Emery Board My Sister's Been Making A Gap In Between Her Front Teeth With An Emery Board Is This Damaging Her Teeth?

My sister's been making a gap in between her front teeth with an emery board is this damaging her teeth? - emery board

I am quite surprised that I had beautiful teeth, and recently I noticed that catch his two front teeth are lagging behind. This morning I came, stood before the mirror, rubbing sandpaper between the front teeth, I'm crazy about him and wonder why it's stupid. She said she wanted to "character" and if a gap between teeth in order to resolve this problem.

Is it damage the teeth? I can not believe say, 'cos they're ugly teeth in the gaps I have one, but why should I do, is that damage teeth!?