How do Brazilians (men in particular) deal with carrying a toothbrush around? Especially a post-brushing, wet toothbrush? I can barely deal with carrying my cellphone. I don't know where I'd keep a toothbrush on my person!
On another hygene front (or rather, back) ... I wish Americans would take up the European (and perhaps other areas) practice of using the bidet. I have seen shocked horror at the unhygienic American practice of mere paper to clean up after doing one's business by those who use the far more cleansing bidet.
Last bit: Does anyone buy into the stereotype that sci-fi fans are, as a group, less hygienic than "regular" folks? Bathe less often? Brush their hair once a month, that kind of thing?