The long hair, swaying and free

(Knock knock knock)
Someone's at the  door
It's a white figure, I let it in

(Knock knock knock)
Someone's at the door
It's a black figure, I let it in

I let them both in
But the hair is no longer free?
No it's tied, captured by one thing...

The black figure suggest I cut it
The white one suggest I doesn't
The white offers freedom,  but the black seems more appealing

I choose to alternate, but one thing is missing
My Hair.