It is advised to brush your teeth at least twice a day, but when? Just before bed is a gimme because you're about to lie mostly still for 6+ hours. Best to not leave food particles to fester.
What's the best time for an earlier brushing? After breakfast? After lunch? After work/school?
Plus, what's up with TV and movies having breakfast scenes where they get up and head right out the door? Did they already brush and now they're going to leave food to fester all day? Eww.
Yup, that's what my dentist recommends. If you do that, just make sure you have a toothbrush and toothpaste which doesn't hurt your teeth :)
Dentists have a strong pro-brushing bias though.