Nail biting is slightly more common in females at all ages. While nail biting may be benign, it can lead to extremely short fingernails, infections of the nail, oral herpetic infection, herpetic whitlow, damaged dentition, fracture of teeth and even gum infections. Moreover, the nail and finger often look aesthetically unpleasing.
Like most things in psychiatry, no one really knows why people bite their nails repetitively. Three common reasons include bad genes, a poor environment and a difficult childhood.
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