I like to begin each class with what I call Q/A. I use it for:
Q/A: We brush our teeth 3 times a day, we floss (or least we should), we drink fluoridated water. So why do we have cavities and there is little evidence the ancients did. There are almost no examples of Neanderthal cavities (people living 30,ooo to 200,000 years ago). Paleolithic (old stone age-people living 12,000 years ago) and mesolithic (mid stone age -people living 5000 to 15,000 years age) human skulls are almost devoid of cavities.
HINT: the answer has to do with:
“As human diets began to modernize, as we began cooking and cleaning more of our daily foodstuffs, a strange thing happened: The bacterial colonies in our mouths became far less diverse. Hunter-gatherers from 7000 years ago had far more microbial diversity in their mouth than did Stone Age agriculturalists. Bacteria that had coexisted and coevolved with our bodies and diets that had adapted, were crowded out by a new environment, and our mouths became colonized by nastier bacteria. We further repopulated our mouths with the ever more widespread use of processed sugars. The incidence of cavities exploded. We began to suffer chronic oral disease, something that became most bothersome, and sometimes even deadly, in the pre antibiotic, pre-brushing, pre-dentist era”.1
DelanceyPlace.com Evolving Ourselves by Juan enriquez and Steve Guilans