That's the wonderful thing about make believe land. You get to decide. However, by tradition, there is one tooth fairy (who, magically, is able to get to all children whose teeth are placed under...
Well a fairy wand is just realy girly and little children beleive in fairys and think there pretty and a fairy haven is there little groto well sometimes chilfren
The legend is that if a child were to step into a fairy ring, then fairies would come and fly the child away. They don't live in them, they're more like portals.