7 Basic Things You Won’t Believe You’re All Doing Wrong is an interesting read about daily things most of us do wrong, including (among others):
Traditional wisdom […] is that we should brush twice a day, after meals.
…dentists are now recommending that people, especially small people between the ages of five and 10, not brush their teeth after every meal. The reason is that the acidity in food and beverages causes tooth enamel to soften, and brushing right after eating an acidic meal strips enamel from the teeth, leaving them vulnerable to cavities.
Each item includes a So how the hell are we meant to do it? section. For Pooping (because sitting on a toilet causes hemorrhoids and other fun ailments):
We were not meant to sit on toilets, we were meant to squat in the field.
I don’t know how accurate that information is, but it’s on the internet so it must be true.