The teeth are indeed supposed to glow. But not exactly like that. It was an error, which occured in the last render: The teeth had a light illumination on them like what one can do for the eyes to accentuate them. But right before the final render, apparently I deactivated the shadows for the teeth accidentally and that is how it became like that. I noticed too late and thought, it's not that bad. Well, RD brushed her teeth with fluorescent toothpaste then
With the right settings it could turn out pretty natural. But this would need a lot of tweaking and testing and with these epic rendertimes this would be insane. If I needed moving hair for an animation, I would make a better hairset.