I trapped my finger in a steel door and split one nail right the way down. OMG was it painful! I struggled for YEARS, trying to sort it myself. Plasters, superglue, steri-strips, creams etc, then swallowed my pride and went to a nail bar. They put some resin (?) stuff on, waited till it grew out (with regular visits) then I used Working Hands Cream by O'Keefe to put on the new nail. Sorted! With plasters and things, you can't put your hands in water and with the resin you can!
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