The audio commences with the ambient noise of a bustling intermediate classroom, a cacophony of chatter, rustling papers, and occasional laughter. Amidst this, the authoritative yet friendly voice of the instructor rises, guiding the class through the process of cleaning teeth. There's the crisp sound of the instructor flipping through the pages of a manual or textbook. She thoughtfully explains the importance of oral hygiene, her words punctuated by the occasional scratch of chalk on the blackboard as she illustrates her points. Next, the audio focuses on demonstrating the correct brushing technique. A soft, rhythmic scrubbing sound fills the room, impersonating the back-and-forth movement of a toothbrush over teeth. This is followed by the lighter, quicker sound of the toothbrush being moved vertically to clean between the teeth. The class listens attentively, the previously noisy room now filled with the sound of concentrated silence. The instructor continues to detail the import