A smile, a smirk, a laugh, a beam, a grin, a twitch, a glitch, a tickle of the face, a relaxed brow. Does the mouth ‘leak’ to broadcast unintended signals and feelings? Bared teeth, the emblem of beaming happiness, may also signify other face-to-face gestures, conveying subtle, simmering emotions other than joy. The vocabulary arising from the flashing of teeth is fluid, varying across cultures and society. Masked emotions in public recently gave way to uniformed face masking, and to discussions via the screen. What potential lies in these primal signals in an increasingly intangible world?