Book ChapterDigital resources are stored online in your NSTA Library.
What kind of toothbrush do you use—manual or electric? What is the shape of the head and the handle? Could you describe the firmness and the layout of the bristles? Or count the number of bristles? In this 5E Model lesson, students explore various manual toothbrush designs. This free sample chapter also includes the Table of Contents, Preface, and Index.