Stylized 3D, vertical 9:16, Pixar cinematic. Two-beat. Beat 1
(mouth-world): the black floss (match master_floss_black) slides
through the gap and sweeps the food-chunk (match
master_bacteria_food) and bacteria out in one clean pull. Beat 2
(MACRO real): extreme close-up of the real black floss gliding
between two enamel teeth, lifting hidden debris out, clean gap
revealed, no fraying. REVYLINE readable beat 1. No on-screen text.
