farming civilization. In
hunting period, the mandible of human is longer because of long-term meat eating and more chewing.
But it can’t be ruled out that other reasons may also be related to weaning habits. People weaned their children later in the hunting period
in a study published by bengtingervall and Elias bitsanis in 1987, it was found that children who chewed gum for two hours a day in a year had slight changes in the shape of their mandible, but the mandible did not grow These children, aged 7-12, are in the period of the softest diet in their lives
what’s more, the animals in the experiment eat either very hard food or very soft food, even almost liquid food, which does not reflect the differences between farming civilization and hunting period The experiment also looked at the effects of raw and cooked foods. The results were extremely complex, but the basic conclusion is that human face may evolve in a smaller direction, which is a response to the tendency of soft diet and more processed food
modern medicine makes the problem worse, because in the old era, teeth may fall off themselves, thus making room for wisdom teeth
but as parents of children, have you ever given your children dry potato chips and chewing gum every day? If not, when you have wisdom teeth, you may have to blame “natural selection”!