How astronauts deal with the boring parts of being in space

Is there training at NASA or elsewhere for this kind of stuff? There are analogues of the space station and the modules to prepare you for how to handle things. You go see how you're going to do the so-called mundane things you'll be doing in space. And when it comes to figuring out how you'll do these things in space, there's the parabolic flights you go on, where you experience weightlessness for 25 seconds at a time. But we never really take weightlessness training to do other things, like cleaning your teeth.