I'm not sure how much stock to put in Weston Price's theories, but here is something I thought of. Native Americans have a major dietary problem--rampant diabetes, something fairly recent for them. I watched a documentary once on what happened when one tribe revived their traditional diet, and the effect were extreme in terms of their return to health. Googling for videos on "Native Americans diabetes" brings up a few links like this one:
Many of these populations absolutely cannot handle the mainstream American diet. They seem even less physically equipped to handle it than other groups.
So I wondered offhand if Native Americans have orthodontic problems and found this:
http://www.ncbi.nlm.nih.gov/pubmed/1941776
So apparently, they have more malocclusions and poorer dental aesthetics than the general population in the U.S. I wonder if this problem has developed along with the dietary changes.