# Riddle with a fang

My head is grey and I guess my tail is too

I'm straight as a pencil if brand new

If used correctly my fang should disappear

Only to leave my head shown clear

Looking around I'm not usually seen

And this math equation can be true if done by me

1+1=1

What am I?

• Hi Brandon, welcome to puzzling! Your answer should address all clues given by the OP, including the first line My head is grey and I guess my tail is too. – Matsmath Sep 9 '16 at 20:43