Where I live, they've been wearing these to school for several years now.
It's pretty disgusting when they take them out & put them on their desks.
Super-attractive, let me tell you.
Last year, it was a female student who got into a catfight and got her dangly belly-button ring/decoration yanked out. Three months' worth of antibiotics, and actual plastic surgery on her tummy to make the button look right again.
Kids are just stupid.