>>43716182The Little Mouse, or La Petite Souris, is a fairy tale legend popular in most Francophone countries, most notably in France, and Wallonia. The legend of the Little Mouse ties in with that of the Tooth Fairy, the difference being that in this case, a little mouse sneaks in while the child is asleep, and replaces the lost baby tooth kept under his/her pillow with coins.
Similar legends exist in Hispanic culture, such as Ratoncito Pérez, as well as most South-Asian cultures from India to Japan. It was said in lore and mythology, that if the lost baby tooth of a child was found by an animal, the adult teeth that would follow would bear resemblance to the teeth of that animal. Hence, a mouse was often the animal of choice, because rodent teeth are sharp, and keep growing.