The reason why convex mouth is the ugliest lip shape is because not only the mouth looks ugly, but also it affects the whole face, the chin shrinks back and the chin line is not obvious. In fact, many people's protruding mouths are not born, but are caused by acquired tooth expansion through oral breathing. We can also improve them according to actual conditions.
Our Asian facial features are not particularly concave and convex, and many people have different degrees of convex mouth phenomenon. The so-called convex mouth means that the whole lip protrudes forward, which looks very rustic and uncoordinated, and the whole person will look dull from the side.