The white, crescent-shaped spot indicating this area is the lunula. If a nail is torn off, it will regrow if the matrix has not been severely injured. White spots on the nail are due to bruises or other injuries. They will grow out as the nail grows. The state of a person's health is often indicated by the nails.
Illness often affects their growth.
The horns, claws, talons, and hoofs of birds and animals are made of the same materials as the nails on the fingers and toes of the human body. Deer antlers are a different kind of growth. How to cite this article.