This morning, after breakfast my DD6 turns to me with the most excited look on her face, "MY TOOTH!" then she ran down to her bedroom...
I forgot...
She was in tears...I said, oh, I stayed up all night last night, so she prob. didn't come because of me...
She saw me awake.. "mom why didn't you go to BED!"
My DD8 is now at an age where he doesn't believe in the toothfairy, Santa, etc. He's too much of a butt head, and I do worry, if I sit him down and talk to him, he WILL say something to DD6...
toothfairy screwed up AGAIN... 
My SO, went to do the tooth once, and my DD8 caught him. Guess SO stood there digging in his pocket for change...
and told DD8 to go back to bed... hense...DD8 doesn't believe in toothfairy...