The traditional diets (which varied dramatically, by the way) resulted in consistently good teeth for people who never touched a toothbrush. In fact, their results were much better than those of people on processed diets who had toothbrushes. That's the point.
Right. My point is that a scientific text has the form "we researched this and here are our findings: things that support theory X and things that support (not X)" rather than "this is my point X and here is evidence for X".
Have his findings been independently verified? Especially his claims that the bone structure is better in the individuals on native food, for which he provides almost no evidence.