your personal HYGIENE or
the fact that your science,
The Big Bang Theory Season 11, Episode 17
Third World HYGIENE.
The Big Bang Theory Season 5, Episode 1
Intelligence,
ruthless attention to HYGIENE...
The Big Bang Theory Season 2, Episode 13
I let you buy
feminine HYGIENE products
The Big Bang Theory Season 7, Episode 2
And after that I'll make up my own rules
of oral HYGIENE...
The Big Bang Theory Season 6, Episode 21