if you never cut your fingernails they'll get longer and longer and longer until they finally start curling around on themselves as they continue to grow and this is because fingernails actually never stop growing the longest fingernails in the world currently belong to Diana Armstrong whose nails are over 42 ft long now if you're like me you probably find this kind of disgusting and for good reason fingernails aren't meant to grow this long and can actually become a health hazard since they Harbor bacteria