I remember a nurse coming to our school to show us how to brush our teeth, demonstrating with a very large set of plastic gums & gnashers with proportionally large toothbrush. This was for the P5/6/7 classroom (early/mid 1970s). Shared classrooms, those were the days! My favourite teacher taught us parsing & analysis, deviated continuously from the subject in hand (much to my delight) but she was once presented with a turd by one of my classmates. Not very well mannered of him.