Does it really save animators that much time to not color in the fangs? This looks so dumb to me. It doesn't bother me in black and white manga manga, bu in anime t I can't help but seeing this as some sort of weird extra bit of skin because the fangs are a different color from the rest of the teeth; they're the same color as the skin.
I think is meant to be an anime stylistic choice. It looks cute in manga 100% but I'm not sure if it works in anime too. Maybe depending on the character, I don't think the fangs in nagatoro were designed specifically to make her look cute
from looking at this video, I'd guess it does save time and they don't want to bother.
It looks weird and I could complain but I feel like is one of the little things that make anime unique, don't you think? I can get used to them.
Next up is eye clipping through hair bangs.