After literally years of research, I can now say that I am an expert on Tooth Fairies. I've decided not to let all that research go to waste, so I'm going to start sharing Secrets of the Tooth Fairies.
The first secret is "tooth falling season". There are a couple of times a year when baby teeth, like tree leaves, fall. If you've lost a tooth during tooth falling season, and it's not your first tooth, the tooth fairy may take several nights to get to your tooth. Nothing personal, it's just that the priority is to protect those children that have lost their first tooth.
Feel free to ask me any questions you may have about tooth fairies. If you don't ask, I'll share anyway :)