Small or no moons may indicate low metabolism while large moons may indicate an active metalbolism. These nail moons disappear with age. The average growth rate a day is 0.1 mm . Nails grow fastest on the more active hand. Fingernails grow at least 2 times faster than toenails.
Young people grow nails at a faster rate.
Avoid harsh metal files. File every nail tip from the corner to center but don't file deep into the corners. Leave the cuticle alone . Cutting it invites infection on the nail's tissue. Short nails are easier to maintain.