After weeks of wiggling- the tooth is bound to come off. If it happens at school-storage is an important issue. The precious tooth can not get lost. There is money at stake here!
At my kids school they have a “Transportation Box” for these situations. The box (that´s actually a glass jar) has been made special with small stickers and a tag saying that “The box has to be returned to the Preschool” once the delivery has been made.
Then the money-making can begin. The Swedish tooth fairy likes to pick up the teeth nice and clean so the kids have to put them in a glass of water before going to bed.
And in the morning, hopefully, there is money. In some rare cases the tooth has still been sitting there. Usually there is a neglecting fairy to blame. Or maybe “he got stuck in traffic”. If so.. just do the same thing next night but make sure to set an reminder on your phone.