Get up to 70% thicker nails in just 4 days* with Sally Hansen Miracle Nail Thickener. The exclusive calcium and ceramic gel formula help strengthen, reinforce and smooth nails. This treatment fills in ridges and imperfections so nails look smooth, healthy and shiny. Fragile nails become super-resilient so they can grow strong and beautiful. Weak nails need a miracle? *Measured layers of nail protection.