They do that on purpose and some even have dental procedures to make their teeth crooked. Different culture and style.
Discussion
I mean honestly between a 5 foot Japanese girl with messed up teeth, a mediocre face, and squinty little eyes are more attractive than most of Western societies 6 foot models who are mostly artificial.
And yes before the offense police come in, yes there are ugly Japanese women, and there are attractive western women.
I have no issue with messed up teeth. My parents couldn't afford braces growing up 😅