Final answer:
The nail matrix is the part of the nail that, once destroyed, will not grow again. It is responsible for nail growth, and damage to it can lead to permanent loss of the nail. Proper nail care can protect the health of the nail matrix.
Step-by-step explanation:
The part of the nail that will not grow again once destroyed is the nail matrix. The nail matrix is a layer of living epidermal tissue located at the proximal end of the nail, which continuously divides to allow for nail growth. This growth process forms the nail root and eventually the nail plate, which is the visible part of the nail. In contrast, the nail plate is composed of dead cells, and while you can trim the nail plate without affecting growth, damage to the nail matrix can result in permanent loss of the nail.
An injury or surgical removal that destroys the nail matrix disrupts the supply of new cells, leading to a permanent end to the growth of that portion of the nail. In some severe cases, the nail plate can detach and fall off; however, if the nail matrix remains intact, the nail can regrow over time. Good nail care, including protective measures and avoiding cutting the cuticle, ensures the health and integrity of the nail matrix, and by extension, the nails themselves.