Are buttcracks normal in school?

I am an education major in college. I have been observing in some schools and I noticed some girls and some guys buttcracks were showing in class. Is this a common thing in school? Do they know it is showing? When I am a teacher, what should I do about this?

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gamerguy507 · 26-30, M

I think it’s nice when someone tells me my buttcrack is showing