Your fingernail is not growing longer by stretching from the tip.
New material is being produced behind the visible nail and slowly pushed forward.
Think of it as a tiny keratin conveyor belt.
The nail matrix does the manufacturing
Near the base of each nail is living tissue called the nail matrix.
Cells in the matrix divide and produce keratin, the tough protein that makes up most of the nail plate.
As new material forms, older nail cells are pushed outward.
Those cells flatten, harden, and become the part of the nail you see.
Is the visible fingernail alive?
The nail plate itself is made of dead, hardened cells.
That is why cutting the white end does not hurt.
The tissues under and around the nail are very much alive.
Cut or tear too far into those areas and the difference becomes immediately obvious.
Why do fingernails grow faster than toenails?
Fingernails generally grow faster, although the exact reason is not reduced to one single factor.
Blood flow, use, local growth activity, and other biological differences are involved.
Growth also changes with age, health, season, pregnancy, injury, and individual biology.
Do all fingernails grow at the same speed?
Not exactly.
Different fingers can grow at slightly different rates.
The dominant hand may grow somewhat faster in some people.
Even the same person’s nail growth can change over time.
Why does a damaged nail take so long to look normal?
Because the damaged section has to physically grow out.
If the injury occurred near the base, the mark may need months to reach the fingertip.
A completely lost fingernail also requires time for the matrix to manufacture a replacement.
The growth cannot be rushed very much.
What happens if the matrix is badly injured?
Damage to the nail matrix can affect how future nail grows.
A serious injury may produce ridges, splitting, altered shape, or permanent changes depending on the extent of the damage.
That is because the factory itself was injured, not just the finished product.
So your nail is not stretching longer from the tip.
It is being manufactured from behind and slowly pushed forward.
Basically a tiny keratin conveyor belt that never asked whether you wanted another clipping session.
The same body systems connect with Why do fingernails get white spots?, another everyday effect with its own underlying mechanism.
And that’s the short explanation.
Related explanations: Why do fingernails get white spots?, Why do we have fingerprints?, and Why do our fingers wrinkle in water?