The lines became smoother. Animators began using more varied shapes to convey nuanced emotions like cringe or extreme excitement.
Furthermore, these assets are highly versatile. They can be stretched, squashed, and rotated to fit any object character, from a slice of bread to a literal black hole. Where to Find BFDI Mouth Assets bfdi assets mouth
There are two main sources accepted by the community. , as those are often low-resolution or contain recolors. The lines became smoother