I don't think I follow. I believe we have the science to prove that having food stuck between your teeth is worse than not having food stuck between your teeth.
We have science that aluminium in the brain correlated to alzheimers, and aluminium cookware causes high level of aluminium in the brain - but further science can't find a connection with alzheimers and cookware. (Note, the above is the state of science as of 20 years ago, things may have changed)