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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.
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.