Professional Nail Brush On Nail Glue - 6 Gram (3 Pack) - Strong Adhesive for Acrylic Nails, Press On Nails & Nail Art - Perfect for Salon, Home Manicure & DIY Nail Extensions

You need to reapply it about every 4 days, but I have used it on natural nail breaks and kept the nail from breaking off until the break point grows out to where I would file the nail anyway. I have long nails and that can be several months! As long as the break is less than halfway across it works great, more than that and it will work if the break for a little while, and if it broke below the nail line will work until it grows to nail line or a bit longer, keeping you from having a painful nail.