There’s been a significant upswing in the number of women who have two or more manicures in a six-month period. • The mass nail care market has grown by leaps and bounds for the past three years—dwarfing the relatively sleepy growth rates seen in other cosmetics categories, according to industry experts. The explosive growth in mass-market sales of nail care products continued into 2012, as nail care sales grew 26% for the 52 weeks ending April 15, 2012, according to data cite...