Somewhere tonight, a mouse is collecting teeth.

Every kid loses teeth. Not every family hides them under a pillow.

The version most American kids grow up with is the pillow. The tooth goes underneath it that night, and by morning it has been traded for a coin, courtesy of a tooth fairy nobody has ever actually seen. It is such a familiar ritual that it can feel like the only version there is. It is not, and it is not even close to the oldest one.

Around the world, families have been finding ways to mark this exact moment, a tiny, slightly strange loss that also happens to be a small milestone, for a very long time. Some traditions involve a mouse. Some involve a bird. A few of the older ones involve throwing the tooth as hard as a kid can manage, and at least one involves fire. None of them are wrong, and knowing a few of them tends to make the whole thing more fun, not less.

The mouse who got there first

Long before an American tooth fairy showed up in storybooks, French children were already leaving their teeth for La Petite Souris, a little mouse who slips in overnight and swaps the tooth for a coin. The same character shows up across Spain and much of Latin America as Ratón Pérez or Ratoncito Pérez, sometimes drawn in a tiny suit, sometimes just imagined as a very tidy mouse with excellent night vision.

The choice of a mouse is not random. A rodent's front teeth never stop growing, which made it feel like a fitting stand in for something that helps a brand new tooth come in strong. However the story got started, the mouse traditions are older than the fairy version a lot of American kids grow up with, and in plenty of Spanish and French speaking households the mouse never lost the job to a fairy at all.

In some places, the tooth gets thrown, not tucked away

Skip the pillow entirely and you land in a different set of traditions, common across Korea, Japan, Vietnam, and parts of China, where a lost tooth gets thrown rather than saved. An upper tooth is tossed downward, toward the floor or under the house. A lower tooth gets thrown up, sometimes onto the roof. The logic runs in the direction the new tooth is supposed to grow: a lower tooth needs to come in from below, so the old one gets sent upward to clear the path, and the reverse for an upper one.

Often the toss comes with a wish said out loud, in some versions addressed to a bird, in Korean tradition specifically a magpie, asking it to bring back a strong new tooth in trade. Nobody is expecting a coin by morning in this version. The point of the ritual is the wish itself, not the transaction.

Old teeth were never just trash

Go back further and the traditions get more specific about how much a baby tooth mattered. Old Norse sources mention a tooth fee, though by most accounts it was a gift marking a child's first tooth arriving rather than a payment for one lost. Teeth also turn up strung onto clothing or carried as a small charm, on the belief that a child's tooth held a little luck of its own.

Which is where the genuinely eerie versions come from, because luck cuts both ways. In older European folklore the worry ran in the other direction: a tooth left lying around could be found by someone who wished the child harm, so the safer move was to burn it or bury it where nobody would come across it. That is the same instinct as a coin under a pillow, wearing a much darker costume.

Versions of the gentler idea, that a baby tooth is too important to just toss in the trash, show up in a lot of otherwise unrelated places: a tooth buried under a young tree so the next one grows in as sturdy as the tree does, a tooth kept in a small box as a keepsake, a tooth fed to an animal so the replacement grows in as strong as that animal's teeth. Different continents, different animals, remarkably similar idea underneath it all.

What all of it has in common

Line these traditions up next to each other and the differences are the fun part: a mouse in a tiny suit, a magpie circling a roofline, a tooth going into a fire so nobody else could get hold of it. But underneath, every one of them is solving the same small problem: a gap in a smile, occasionally with a little blood involved, that could easily feel unsettling if nobody made a fuss about it.

Instead, across an enormous range of cultures with nothing else in common, the instinct has always landed in the same place: turn it into something worth celebrating. A visitor. A wish. A small surprise. A tooth that becomes a story instead of just an event. That is a genuinely nice thing to hand down, whichever version a family uses.

For what it is worth, the biology is stranger than any of the folklore. The tooth that finally lands in your palm is usually a small hollow shell, because the root was quietly taken apart from underneath over a period of months while everyone upstairs was busy wiggling it. We put the whole mechanism in our guide to the science of baby teeth, which is worth reading before your child asks where the rest of the tooth went.

One small thing worth keeping on hand

Whichever tradition your family leans on, the practical snag is identical in all of them: logistics. A loose tooth does not wait for a convenient moment. It comes out at school, in the car, or mid trick-or-treat with a mouth full of something chewy that had been working on it all night anyway. A small container kept in a backpack or a coat pocket, a tin, a little zip bag, a locket, solves that problem before it happens. No tradition survives a tooth that got lost in a coat pocket on the walk home.

If it does happen on Halloween night, the tooth is the easy half of the evening and the pillowcase full of candy is the hard one. How we would pace that haul is its own post, over in our Halloween candy strategy.

As for the tooth itself, one that wiggles its way out on its own schedule is simply what growing up looks like from the inside, and the elementary years are mostly one long run of it. A tooth that leaves earlier than you expected is a different situation: decay or a knock can take one out before its replacement is anywhere near ready, and the space it leaves sometimes needs holding until that tooth arrives. So call us at (239) 482-2722 and describe what you are looking at, especially if a tooth was knocked out rather than wiggled out. Our emergencies page covers what the front desk will ask.

And if a wiggly tooth has your child more nervous than excited about the whole business, there is a story for that. Shades and the Wiggly Tooth is one of the free books on the Storybook Reef: one of Shades' teeth starts to wobble one morning and the reef talks him through it. The printables on the same page include a certificate for the big day a little tooth finally sets sail, whichever tradition you are running that night.