If you accidentally used your husband's brand new $15 toothbrush because you were so sleep deprived and your contacts were dry so you didn't see the "blue for boy" color on the toothbrush and mistook it as the "white for girl" one which is yours? Would you:
A) Tell him so he can decide if he wants a new one
B) Not tell him figuring you've shared a lot worse that THAT and he won't miss anything if he is none the wiser
c) Write it on your blog in the off chance that he might actually read it, which he rarely does, but by then it will have been too late because he will have brushed his teeth with it. So that will probably make him keep it.
Oh, decisions, decisions.