This Perfect Formula Strong Nail System is Brand New. The Boxes are damaged. (Please Refer to Pictures) Damage on Boxes may vary The Strong Nail System promotes a combination of strength and flexibility for longer, stronger nails. Strong Nail Strengthening Therapy gives temporary immediate strength to nails while infusing and locking in moisture so nails can grow stronger and longer. Strong Nail Daily Moisture is a unique moisture formula that contains jojoba oil to condition cuticles and maintain the moisture balance in the nail to prevent brittleness. Who is it for: All nail types, but highly recommended for anyone with brittle nails. Why is it different: Strong Nail Strengthening Therapy is a revolutionary formulation where oil is incorporated into a nail lacquer system. Both products contain keratin, the main protein that makes up the nail.