The short answer: nobody knows for sure, and that is useful, because it means your family gets to decide. Most parents tell kids that the tooth fairy uses the teeth to build a castle, make stars, or keep a collection. Another option is that she turns the tooth gold and returns it. Pick one answer and stay with it.
What do parents usually say the tooth fairy does with the teeth?
Ask ten parents and you get ten answers. A few that tend to work at the kitchen table:
- She builds a castle. Every baby tooth is a brick. This one holds up well, because the fairy needs thousands of them, and no one expects to see the castle.
- She makes stars. The teeth go up and become small lights. Kids who like space tend to like this one.
- She keeps a collection. A museum of every tooth she has ever visited, on shelves, in tiny jars. It is a good fit for a child who collects things.
- She gives them to new babies. The idea that baby teeth are handed on works well for kids who have a younger sibling. It is gentle and a little odd, which kids like.
- She grinds them into fairy dust. Some families like this because it explains the glitter. If your child is squeamish, skip it.
Pick the one that suits the child standing in front of you. A kid who asks "why does she want my tooth?" often has a worry behind the question. Listen for it.
Why do kids ask this the first night?
Because a lost tooth is the first time many children give something up. The tooth is part of them. It has been in their mouth as long as they remember, and now it is going to a stranger. The question is usually "is it okay?" in disguise.
A clear, calm, consistent answer settles it. If you say the fairy builds a castle on Monday and makes stars on Tuesday, a careful kid will notice. Write your answer down on a sticky note and put it in the drawer where you keep the cash.
What if my child wants to meet her?
Fairies keep their homes and their schedules hidden, the same way you hide a surprise party. You can say that the fairy only comes when everyone is asleep, because that is when it is quiet enough for her to work. If a child tries to stay up, "the fairy knows" is usually enough to send them back to bed.
Some families leave a small note thanking the fairy for coming, and a glass of water for her. A kid who has made the note is often less interested in staying awake.
Where did the tooth fairy idea come from?
The history is shorter than you would think. According to one account of the tradition, the earliest American reference dates to 1908, when a Chicago Daily Tribune column advised parents about "the tooth fairy". A 1927 play by Esther Watkin Arnold helped turn losing teeth into something to look forward to (Spokesman-Review: https://www.spokesman.com/stories/2020/aug/19/origins-of-the-tooth-fairy-one-tradition-first-ros/).
The same account notes that in France, a mouse called La Petite Souris exchanged coins for teeth left in a child's shoe or slipper, and that in Spain, an 1894 story written at the request of a queen for her young son introduced El Ratoncito Pérez. We cover more of this in our piece on tooth fairy traditions around the world.
What does the Gold Tooth Fairy do with the teeth?
She leaves them. This version is for parents who do not want to hand the tooth over and forget about it.
In the booklet that comes with our kit, the Gold Tooth Fairy turns each tooth gold, and then the tooth goes into a small glass vial with a dated label. She is too small to hold a tooth, so a grown-up does the holding and the coloring with the gold marker. She reads the date on the vial, writes it in her own list, and leaves a trail of gold dust on the windowsill.
The tooth stays with the child. The fairy keeps the story.
You can use this version without buying anything. Take the tooth out of the sandwich bag, put it in a small jar, and write the date on a label. The kit just puts the marker, tweezers, vial, stickers, booklet and dust in one box.
How do I keep the story consistent?
A few habits help:
- Write down what you said. A note in your phone, "Fairy builds castle from teeth, leaves gold dust", is enough.
- Keep the evidence consistent. If the fairy leaves dust on the windowsill once, leave it there every time.
- Let the child add to the story. If your child decides the fairy has a cat, the cat is canon.
- Do not over-explain. If a question has an answer your child finds delightful, stop there.
What should I avoid saying?
Avoid anything that frightens a child. The tooth fairy does not come into the mouth, does not remove teeth, and does not punish a child who does not brush. If your child is worried, say that the fairy only comes for teeth that are ready to come out.
If a child has lost a tooth after an injury or the tooth did not seem loose, call your dentist.
FAQ
What does the tooth fairy do with the teeth? There is no official answer. Families choose: a castle, stars, a collection, or a version where she turns the tooth gold and leaves it in a vial.
What if my child asks to see the castle? Fairies keep their homes hidden. Move the conversation to what your child would put in a castle of their own.
Should the tooth fairy take the tooth? That is up to you. Taking it and leaving it both work if the story stays consistent.
Where did the idea come from? One history traces the first American reference to a 1908 newspaper column, and mouse versions to France and Spain.
Sources: Spokesman-Review, "Origins of the Tooth Fairy" (opened and read 2026-10-01).