In the series, Gisele and Martin are "tooth mice": mice who perform the duties of tooth fairies. When a child in need loses a milk tooth, the two mice.In the series, Gisele and Martin are "tooth mice": mice who perform the duties of tooth fairies. When a child in need loses a milk tooth, the two mice.In the series, Gisele and Martin are "tooth mice": mice who perform the duties of tooth fairies. When a child in need loses a milk tooth, the two mice.