- Create a character/use the "showracemenu" console command, lower all jaw- and chin-related values to their minimum, and choose a thin-lipped mouth
- Observe the character's while in combat, or after typing "player.setav mood 1" or "player.setav mood 4" in the console
Having discussed the matter with the mod-maker bhaktisean, he has hypothesized that it could very well be a part of the teeth model which would become visible when certain facial expressions were made
Feel free to message me in case any further information is required
Thank you in advance for your attention towards this matter