Sally Hansen Hard As Nails Hardener 

Toughen up weak, fragile nails! Reach for Hard as Nails®, the original strengthener from Sally Hansen. Our unique blend of Film-Formers shields nails, for long-lasting protection against chipping, splitting and cracking. When you want your nails to grow longer and stronger, Sally Hansen’s Hard as Nails® is here to help! Apply to bare nails and under nail tips.