Stylized 3D, vertical 9:16, Pixar cinematic. Two-beat. Beat 1
(mouth-world): the blue brush (match master_blue095_v) sweeps the
acid-plaque (match master_bact_plaque_v) off, the crack-illusion
healing as enamel cleans. Beat 2 (MACRO real): extreme close-up of
the real blue brush head on enamel — bristles vibrating, foam,
droplets, an acid film lifting to bright smooth enamel. REVYLINE
readable beat 1. No on-screen text.
