Some...

Some examples: 

https://kotaku.com/for-some-folks-side-mouth-ruins-anime-faces-1597880743

The anime/manga mouth. 

Seen widely throughout your classical animes, this particular style draws the mouth often showing little to no teeth when a character talks or emotions. The lips are round and feed directly into the tip of the nose, and doesn’t bring much attention to the mouth in general. This particular style also bleeds into a facet called “ side mouth” of which the mouth is drawn ‘inside’ the cheek and doesn’t connect to the face’s profile. ). When opened, this mouth is often depicted with one side ( the one facing the camera ) drawn more open than the one facing away from the camera, meaning that you can see hints of the inside of the cheek behind the tongue and potential teeth. 

https://www.zerochan.net/Ex+Rumia

The other anime/manga mouth.

This mouth is drawn very similar to the first, except the teeth are more frequently involved, and the inside of the cheeks are not depicted. This can be considered a little more ‘realistic’, as the inside of a character’s cheek wouldn’t be visible when looking at them strictly from their profile. 

https://apps.apple.com/us/app/sonic-the-hedgehog-classic/id316025912

A more “Abstract” way of situating the mouth on the side of the fell is the mouth of the characters from Sonic the Hedgehog. One can speculate that the sided design comes from the character originally performing on a 2D-side scrolling game. Or if it was just an iconic quirk in the initial artist’s design. 

Dreamworks and Disney work on the more realistic end of the semi-realistic spectrum. Dreamworks classics a little more so with the inclusion of the markings around the characters lips as well as a more triangular shape to the lips themselves - when protruding from the face. 

- Mod wackart ( ko-fi ) 

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