>>12834115It is caused by not eating hard or chewy stuff, as well as large groups of children in modern "child-care" which gives kids upper airway infections 53 weeks a year, prevents proper breathing (mouth breathing), impacts stuff like swallowing patterns (tongue thrusting), incorrect tongue rest etc.
All of this has basically been proven by British and US orthodontists, along with ample anthropological evidence (medieval Europeans having much more massive mandibles etc).
Just like caries, it's a symtom of modern life. Either adapt to changing conditions or be prepared to pay up.
t. Dentist
