How Do Fingernails Grow?
Fingernails and toenails are special growths of hardened skin cells. These skin cells are filled with a tough, horn-like material called keratin.
The living and growing part of the nail is beneath the white, crescent-shaped area at the nail’s base. As the new nail cells form, they pack together tightly and slowly push the nail forward.
The fingernails grow about two inches (5 centimeters) a year, slightly faster than the toenails. The nail of the index finger grows faster than that of the little finger; and fingernails require three to six months to grow again completely whereas toenails require 12 to 18 months.
Actual growth rate is dependent upon age, sex, season, exercise level, diet, and hereditary factors. Nails grow faster in the summer than in any other season. Our nails are very useful. They protect the ends of our fingers and toes. Our fingernails also help us to pick up small objects.