I've known those who brush after lunch, but they're few and far between. I tried to get into the habit twice in my life, but failed both times. Once when I was in braces. That lasted a good long while as all the other middle-schoolers were told by their orthodontist to do it and the teachers were patient with the extra restroom time it took. Later in adulthood, but that only lasted a few weeks.

Americans are just funky that way. We'll spend thousands of dollars on dental care for the whitest, brightest, straightest smiles on the planet, and then not brush properly. We figure we can just cap, fill, and bleach our way back every time.