My husband doesn't think it's necessary to wash your toothbrush every time you use it, leading to a collection of sludge (ie saliva and toothpaste) in the bottom of the glass the toothbrushes are kept in. It does my head in. So much so that I now insist on my toothbrush and our 4 yo sons toothbrush being kept in a different place because I don't want our toothbrushes being stored in my husband's drool.
I've given up asking him to wash his own toothbrush, all I want now is that he washes our son's toothbrush before he puts it away and he doesn't keep our son's toothbrush in his drool-filled toothbrush glass. AIBU?