Stronger nails in 1 week! (Based on consumer perception test of 103 participants). Reinforces weak nails. Salon tested. No DBP toluene formaldehyde. America's No. 1 nail brand. What It Is: A fortifying treatment that actively strengthens nails so they will be less likely to break, peel and tear. How It Works: Cellulose fibers form a micro-mesh barrier that supports and protects nails, making them stronger and more resistant to damage. The Results: Stronger nails in just 1 week! (Based on consumer perception test of 103 participants). Cellulose fiber formula forms a protective matrix to help prevent nails from peeling and tearing. 1-800-953-5080 (USA/Canada only). sallyhansen.com. Made in USA.