Since 1974, the U.S. Food and Drug Administration has outlawed a similar chemical, methyl methacrylate (MMA), used in fingernail products. Whilst not 'banned' in the UK, technicians should be using EMA or a less dangerous substitute. MMA is harmful to both nail technicians and customers. However, both MMA and EMA can cause contact dermatitis, asthma, and allergies in the eyes and nose, all problems that nail technicians know about. Both can make the eyes, nose, and other mucous membranes sting, become red, and swell. Customers are at risk, too. Because it is often difficult to tell which chemical in a nail salon is causing a sensitivity or allergy, it is best to control your exposure before you become sensitised.