Methyl methacrylate (MM) is a plastic that has a variety of
industrial uses (for instance, as an input to Plexiglas and to
coatings like latex paints, lacquer, and enamel resins). The dental
trade also uses it to make dentures. This question considers two
broadly defined users of MM: industrial and dental. Trace amounts
of arsenic are occasionally found in MM, although they can be
completely removed either by the consumer or by the producer. The
FDA forbids the sale of...