Then again, yours truly uses toothpaste with nano-hydroxyapatite, which is touted as a non-toxic version of the same mineral that makes up teeth and bones. Skepticism abounds with that stuff ...

Boka toothpaste redefines the standard with nano-hydroxyapatite (n-Ha), a cutting-edge ingredient that's both safe and effective. Originally developed by NASA to protect astronauts' teeth in space ...