Never quite sure what the going rate is for tooth fairies, but we have settled on a dollar coin and a small toy. The girls are very into Squinkies so this works out perfectly. I got a pack at on sale with enough to cover all of her baby teeth.
So that first tooth was a really big deal and she was very excited to leave it under her pillow. None of my kids wants the tooth fairy to keep their teeth though. I'm fine with this, they are their teeth after all. Robotson kept, and lost most of his. I expect Funny Girl will eventually lose hers as well, but I've come to terms with this. My mom kept all of my teeth and then a few years ago asked me if I wanted them. As an adult I could see no reason to keep them so I figured there's no harm in letting them have them if they want them now.
When she left her second tooth though she asked me some questions about the tooth fairy - like how does she know when kids are asleep? I answered that she would check to make sure before leaving anything. Then I asked her how big she thought the tooth fairy might be and her answer "As big as you, Mommy." Interesting! So I asked her what she thought she might look like. She said she wasn't sure, so I told her that the tooth fairy can be anything she wants her to be. Then I kissed her goodnight and a few hours later, after checking to see that she was asleep, I left her a coin and a Squinkie next to her tooth.