Scholastic Readers Level 1: Gus Loses a Tooth by Frank Remkiewicz (author) (US edition)

Reassure children about their first wobbly tooth with the help of this adorable little rhino, who helps make a source of nerves a source of fun. When one worrisome rhino gets his first wobbly tooth, he’s so nervous that he trembles and wobbles all over! But when it finally comes out, he learns it’s not as scary as he expects. A sweet and soothing tale about an important part of growing up.