There are many reasons why nails grow faster, because the growth rate of nails, by age, health, season and mechanical stimulation, often friction, it will make the nails grow faster, people generally hand activities more opportunities, so finger nails than toe nails wear fast, so in order to protect the fingertips, finger nails naturally faster than toe nails grow. The same right hand nails grow faster than the left hand, and the middle finger, pinky finger nails grow the slowest, so the nails grow faster during the day than at night, faster than in summer than in winter, that is, the more you use the faster the growth. If I leave my nails uncut, will they grow slowly at the rate of 1mm per day? No, because nails only grow when they are consumed and trimmed, and if they are protected by not cutting, the growth rate of nails will slow down.