Take good care of your nails by sterilizing and trimming them for cracked fingernails. First of all, you should disinfect the cracked nail by scrubbing it with iodophor or alcohol to prevent the crack from getting infected. Then the nails should be trimmed, in the trimming should use a nail file along the outer corners of the nails to the middle of the file flat nails, be careful not to file on the nails repeated friction, so as not to damage the nails. Also pay attention to cleanliness and hygiene, and try to avoid getting water on the split nails in a short period of time to avoid infection, and also try to avoid heavy labor on the finger area. If the symptoms are more serious and difficult to deal with on their own, the injured person needs to go to the hospital in time to provide appropriate treatment according to the specific situation of the individual and the symptoms shown.