I should do it every day but I only end up doing it here and there, or after a meal where I have stuff stuck.  I tend to mouth wash regularly though.
My biggest issue is pepsi.  That stuff is really bad for the teeth. In my past few appointments I've had small cavities starting.  I just can't give it up, though I slowed down a lot, and now I always have a glass of water right after I'm done one.  What makes it worse is when you drink one then just leave it at that.  The acid eats away at the enamel.  If you drink it with food or rinse (never brush!) your teeth after it helps.  Not sure by how much though.