TBH I don't think americans have terrible hygiene. It's more like brazilians have different habits. We shower every day, sometimes twice. We bring toothbrushes around to brush our teeth all the time. And we also keep a trashcan in the bathroom to dispose of toilet paper. That is more bearable than it sounds because brazilians wash their asses before wiping, but it's definitely a culture shock for americans and other peoples who historically had access to good piping.