Missing

Can you tell what is missing from this picture???

It is Nathan's front tooth. Yes I know I write about his teeth falling out a lot, but he is at that stage. He came to me this morning and asked me to feel how wiggly his tooth was it was pretty loose. He came to me a few minutes later with a string in his hand and asked if I could tie it to his tooth so he could pull it out, I told him "No, you will hurt yourself!!" He left and went up stairs. Approximately 30 minutes later he came back to me and showed me a hole in his mouth and his tooth in his hand!! This would have been all fine and cute, but I was planning on trying to get a good picture of all of the kids for Paul for his office, another day!!