The nail can be damaged by nail-biting, scratching the nail folds, bad manicuring , or trauma such as slamming a finger in a car door. Damaged nails may appear ridged or cracked and broken. If they do not appear "normal" after about one year, then most likely the nail matrix has been damaged and the nail will never be normal again.

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Yeah those nails who has a bad past makes it difficult to be cured. My nail also suffered from those stuffs like getting slammed by a hammer. The impact isn't that hard but it left a voilet color inside my nail. Good thing it went off for a month.

Finger nail damaging are common and range from minor cuts and scrapes to wounds with major damage to bone, tendons and ligaments. Serious finger injuries can lead to permanent deformity and loss of function so take proper treatment.

Over exposure to heat and coolness will cause severe damage to the nails. Weak nails will always be a big problem for creating nail damage. Get proper care to keep your nail out of damage.