The Nail Clinic in a bottle! Helps prevent chipping, splitting, cracking. What It Is: The original strengthening treatment, Hard As Nails gives nail a smooth, chip-resistant surface & helps to provide long-lasting protection. Nails grow longer & stronger. How It Works: Nail edges are sealed for protection against chipping, cracking & splitting. The Results: Longer, stronger, harder nails with a beautiful clear finish. Salon tested. No DBP toluene formaldehyde. 1-800-953-5080 (USA/Canada only). sallyhansen.com. Made in USA.