>>23970936Because its /vt/ the home of the whitest nips you know?
The hard line truth is that Japanese don't place a high value on perfect teeth alignment and instead focus on dental health as a whole to the point where braces are not really covered in their national medical care much like how mental health assistance coverage is pretty much none existent do to old ideologies or like how gay rights isn't really a thing for the most part either.
As for covering the mouth while laughing its a fucking manners thing Japs are socially retarded by nature and they would rather not have someone think they are laughing at them also its considered dirty.