>>12832597The reason modern humans need dentistry and orthodontics is because in nature we would have lost some teeth along the way in fights, or illness, or just by chewing on something too hard, the missing teeth would have made room for your teeth to move as you aged, basically nature gives us an extra "magazine" of teeth, but if we never lose any at all from a sheltered modern life, nature's plan goes awry and it can be very painful. I can't see why you would need braces though if your teeth are only a little crooked.
