Blog · September 27, 2026 · 5 min read

What to Write in a Tooth Fairy Letter

A good Tooth Fairy letter is four lines long and mentions something only your family knows. That is genuinely the whole technique — the detail is what makes it real, and the brevity is what makes it believable. Everything below is how to find the detail when it is late and you are tired.

The shape that works

Almost every letter worth keeping does the same four things, in the same order. You can write one in about ninety seconds once you know the shape:

• Name the tooth. Which one, and how long it had been wobbling. Precision reads as attention.
• Say something only your house knows. The dog that barks at nothing. The gap in the fence. The fact that they have been practicing whistling and it is going badly.
• Praise the thing that was hard, not the tooth. Sitting still at the dentist. Not crying when it bled. Waiting a whole week without pulling it.
• Say what happens to the tooth. Children ask this constantly and a letter that answers it unprompted is a letter they believe.

Where the detail comes from

The second line is the one that does the work, and it is the one people freeze on. The trick is to stop trying to think of something charming and instead report something ordinary that you could only know by being there.

A fairy who mentions that the tooth came out during macaroni is infinitely more convincing than a fairy who writes three sentences about starlight. Specificity is the whole illusion. Children are not testing the poetry, they are testing whether anyone was watching, and the answer they want is yes.

Look around the room the tooth came out in. There is always something: the chipped mug, the broken zip on the school bag, the sibling who announced the news to the entire street. Use that.

The first tooth

The first one deserves a longer letter than the rest, and it is the one most likely to be kept. It usually arrives at about age six, and it is normally an incisor — one of the middle teeth at the front.¹ That timing is useful to know, because it means your child has been carrying that tooth since before they can remember anything, and a letter can say so.

Write it as a first, not as a transaction. Something like: this is the first one you have ever sent me, and I have been waiting for it. Say what the gap will do to their smile in photographs. Say that the next one is already on its way up underneath, which is true — the permanent tooth coming through is what loosened this one in the first place.¹

Then keep it. Not in the drawer with the batteries. A lost tooth chart gives every tooth its own line and a space for the story, and a stack of letters clipped to it is one of the few childhood records that assembles itself.

The harder letters

Not every tooth comes out well. Some are pulled at a dentist, some come out on a trampoline, and some cost a great deal of crying. Those letters are the ones worth writing carefully, because the child is not fishing for a coin — they want to hear that the bad bit counted.

Say the hard thing out loud. “I heard about Tuesday. I know it hurt and I know you did it anyway.” A fairy who acknowledges the difficult part is doing the same job a grandmother does. The money is incidental; being seen is the thing.

If a tooth has gone missing before bedtime — swallowed, lost in the grass, dropped down a drain — say so in the letter and make a joke of it rather than pretending it arrived. A swallowed tooth makes a better letter than a tidy one.

The mistakes that give it away

There are four, and they are all avoidable:

• Your own handwriting, unchanged. Use your other hand, or print, or type it. Children know your writing far better than you think.
• Adult vocabulary. A fairy who writes “I appreciate your diligence” is a parent. Short words.
• Length. A page of prose is a parent trying. Four lines is a fairy in a hurry, which is exactly what she is.
• Bargaining. A letter that instructs a child to tidy their room is transparently from management, and it spends the magic on something a note on the fridge does for free.

How much to leave, and whether to say

The letter should not mention the amount. It is the one detail that turns a keepsake back into a receipt, and children who are told the number in writing start comparing it at school. Leave the coin, say nothing about it, and let the letter be about the tooth. If you want the going rate before you decide, the surveyed averages are worth a look and are usually higher than people expect.

It is also worth knowing how young this tradition is. The Tooth Fairy as Americans keep her is a twentieth-century invention rather than ancient folklore.² That is oddly freeing: there is no correct version to live up to, so the one your family makes is as legitimate as anybody’s.

If you would rather not write it at all at eleven at night, she will write it herself — you give her the name, the tooth and the one detail, and she does the rest in her own hand.