You’ll want to invest in a strengthening treatment if you really want to see a difference in nail thickness. Stay away from ingredients like formaldehyde, acetone, ethyl acetate, or butyl acetate if possible, Stern says. 

Stern developed her own kit, called the Nail Renewal System which includes a gentle exfoliant, a buffing bar, and a leave-on hydrating formula. 

“This 3-step system is a revolutionary, once-weekly, nail treatment that immediately reveals a healthy, hydrated, youthful shine. This polish-free system is clinically proven to improve the appearance of nails, leaving them with a healthy, strong, smooth, shiny, glossy, and less brittle look and feel,” Stern says.



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