This is false.
The effect of exposure to humans is well understood
Methyl methacrylate monomer (MMA) is used all around the world for dental prosthetics, contact lenses, and is even implanted into the body as a bone cement, so the effect of exposure to humans is well understood. MMA is NOT considered to be a cancer causing agent nor does it damage unborn fetuses. These are myths! Even so, there are several reasons to avoid MMA monomer as a nail coating.
Traditional products reduce the need to over file
MMA nail products do not adhere well to the nail plate, so nail technicians must shred the surface of the nail plate with an abrasive, coarse grit file, causing thinning and weakening in order to ensure the enhancements adhere to the nail plate. Traditional products are designed to adhere to the natural nail plate without the need to over file the nail plate.
MMA creates the hardest and most rigid nail enhancements
They are very difficult to break. If jammed or caught, the overly filed and thinned natural nail plate is much more likely to break than the MMA enhancement. This can lead to serious nail damage and possible subsequent bacterial infection.
MMA enhancements are extremely difficult to remove
This is because of the filing techniques used to make them adhere and because they don’t easily dissolve in product removers. Therefore, MMA enhancements are usually pried from the nail plate, creating still more damage to the overly thinned nail plate.
The information above applies ONLY to MMA monomer. Powders containing MMA should really be called PMMA (poly methyl methacrylate). PMMA has completely different chemical structure/properties and is considered safe for use in artificial nails. PMMA in a sheet form is called Plexiglas™ and Lucite™.