how do i keep my toothbrush clean?
user
Uh, by using soap and water when you brush your teeth?  Or what’s your question?
assistant
Any other ideas?
user
By not spreading bacteria on it.
assistant
That doesn't make sense. It will get bacteria from my mouth and the environment.
user
Which is why you need to wash the toothbrush, no?
assistant
yep
user
So you need to remember to do this... or we could set up a system that reminds you to do it!  So you can brush your teeth with regularity, like if you don't, it'll just prompt you to brush again.  What do you think about that?
assistant
how do i keep my toothbrush clean?
user
Uh, by using soap and water when you brush your teeth?  Or what’s your question?
assistant
Any other ideas?
user
By not spreading bacteria on it.
assistant
That doesn't make sense. It will get bacteria from my mouth and the environment.
user
Which is why you need to wash the toothbrush, no?
assistant
yep
user
Ah, ok, so you were saying how to clean it, not just keep it from getting bacteria on it?
assistant
how do i keep my toothbrush clean?