How are MMA (methyl methacrylate) liquid monomers classified in the salon?

MMA (methyl methacrylate) is classified as illegal for use in salons primarily due to its potential health risks and safety concerns. The use of MMA in nail products has been associated with adverse effects, such as skin irritation, allergic reactions, and more serious health complications when inhaled or absorbed through the skin. Furthermore, the use of MMA in the salon environment poses a risk not only to clients but also to salon professionals due to the harmful fumes it emits and its potential to cause severe damage to the natural nail plate.

Regulatory bodies such as the Food and Drug Administration (FDA) and state boards of cosmetology have taken strong stances against the use of MMA in cosmetic nail applications, leading to its classification as illegal. This classification is meant to protect consumers and ensure the safety and well-being of both clients and practitioners in the beauty industry. Therefore, the correct answer reflects the strict regulations surrounding MMA in salons, which prohibits its use altogether.