He asked me what I had lied to him about. I told him that he didn't want to know and that if I did tell him that he would regret asking.
He kept badgering and badgering me about it so I finally said " If I tell you, you will be sad and you will be upset that you asked". He promised me that he wouldn't be upset or mad so I told him.
"There is no Tooth Fairy"
I thought for sure that he had already figured out that there was no Tooth Fairy, Santa Claus etc. but I guess I was wrong. He was totally shocked. He asked what happened to the teeth. I told him that I had them in my dresser drawer. Then he asked about where the money came from etc.
I told him that because he knows that the tooth fairy doesn't exist that now he doesn't get any more money when he loses teeth. He was soooooo disappointed.
He was also sorry that he asked.