I was going to skip this response because it’s controversial and scientifically uncertain (as a scientist in a previous incarnation, but seem to have reasonable evidence, look at it yourself), but screw it, I feel your pain, downvote me. Given preamble…

It seems likely that soft foods in the developmental stage of the jaw cause the orthodontic issues common to current first world countries. It may be possible to remedy this with straight up chewing gum at around age 8, but preferably use actual whole food that requires chewing, basically jaw development, and hence teeth positioning requires work. Wish I knew it earlier…