I've been thinking of doing something like this for the KBYG designs.
I wanted Original (2012 style) Taylor to always show her upper teeth whenever she's talking to show her gap (like her dad, Donnie) and I might do the same thing for Modern (Rise style) Nicole.
But Nicole's gap is so subtle that I think it would only be shown whenever she's smiling, as opposed to Original Taylor, which shows up at all times.
But seriously I fell in love with Mikey's little tooth gap :3