i usually do it after but i admit sometimes when i wake up late and im in a rush ill do my teeth straight away and then grab food quickly which i suppose is same as doing them before lol
oh brushing after food is much healthier, if you brush your teeth and then eat food youve pretty much defeated the object of actually brushing them in the first place lol, thats my opinion anyway some people mite do it the opposite way round like you said.
