Methyl methacrylate (MMA) is an acrylic monomer found by the FDA in 1978 to be unsafe for use in nail products because of the health risk posed to manicurists by its use and because of its potential danger to clients beacause of its extreme adhesion.
Required Reading
October 1, 1999
Not to be confused with MMA, EMA has been deemed safe for professional use and consumer contact.