What’s the argument here? That because you drive twice as far, it is expected you run over twice as many people?

Not really. The research papers mention an interaction between an antibody and a gene that controls tooth growth in both humans and mice. If that gene is supressed, there is no tooth growth.

However, every tooth you can ever grow, or at least the embryonal tissue for it, is already present at birth. There is no way to get more, and activating this gene would not give you additional tissue to develop into new teeth.

A vegan (or low-meat diet, for that matter) does not equate to substituting meat to processed meat alternatives. Other recipes that do without any fake meat exist.