This mod replaces the Spawn's fangs to more closely match Astarion's. While his teeth were used as the base, they had to be tweaked to be closer visually since they work differently (think of the way the other spawn's teeth work ingame as dentures, they overlap their normal teeth and hide the rest, making their teeth look "narrow" sometimes)
For a better and more accurate experience (IDC what the game says, the other spawn looking like that is really silly and I refuse to think it's canon) I recommend using it in conjunction with No Eye Glow by Zelliebeans. I'm using this mod for my screencaps.
For an alternate experience where they keep normal, human teeth but are all given normal eyes (and the mod that encouraged me to attempt this!) try Vampire Funhouse by wardenmages. They have also added a version that works with my mod!
I have made sure to replace all the other spawn's teeth except for the tiefling's (their starting teeth are pointier to begin with, so I decided not to touch them and handwave it as the vampiric transformation making them even more "inhuman"). However I haven't manually checked if all their teeth work, so let me know if any npcs look wonky. I have checked Sebastian and the children, but because their teeth are covered in blood, it's not much use to upload screencaps, basically: trust me bro.
Also, while making this I realised Astarion and Cazador have identical teeth except they gave Cazador slightly longer upper fangs. Cool.
Installation:
Simply extract the ZIP you've picked into the Baldur's Gate 3 Data folder.
The path you'll be extracting it into should be something like this: C:\Program Files (x86)\Steam\steamapps\common\Baldurs Gate 3\Data\
To uninstall, simply delete the files (by using the searcher) containing the words "Vampire_Fangs" in the "Generated" folder.
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Special thanks to the DBTR modding community.