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I have a fingernail that always splits in the same place. There seems to be a ridge in the nail. If I get busy and don't keep the nail filed and buffed, the nail splits all the way to the quick. I have tried acrylic nail gel for repair but this kept chipping off. I found that if I file the nail very short, and I brush some super glue on it the nail grows out very nicely. You could try any nail glue too as it has the same active ingredients.
I found a bottle of tinted super glue at my craft store. It goes on light purple and dries clear. Let it cure for at least an hour and file with a fine emery board on top of the nail then buff your nail to a shine. You may have to do this for a few days to build up the nail. I just use it on the area where it is split not the whole nail, then just keep your nail shaped as you like and in a couple of weeks, your nail will have healed with no more split.
One of the original uses for Super Glue was to close wounds on the battlefield. While a cyanoacrylate is functional for this purpose, it should only be used in emergency situations as the glue can be a skin irritant. Neither the Super Glue or Crazy Glue companies recommend using their product for closing wounds.