i try atleast three...depending on how much i eat. i have bad dental genes, and i am gonna end up with fake teeth sooner than later (my mom had them when she was 25, and my gram and my great gram ect). but yah...i am trying to keep the real ones as long as possible.
my strange phobia, once a month i get a new toothbrush. i really wish they just made cheap disposable ones! the though of teeth germs festering on my brush that i am going to stick back into my mouth...