Like many said, it will grow back. I caught my index finger nail on something just last night. It broke just a little bit. I took a trip to the local pharmacy and bought a tube of Super Glue. After I put the glue over the cracked section I took a nail file and smoothed out the dried glue. Works pretty well. After the nail grows out I carefully cut the glued section off with a nail cutter and shape the nail with a file.