There are many reasons why children bite their nails. First of all, it is caused by zinc and iron deficiency in children. It may also be caused by the child’s psychological tension, if the child is very nervous, will also involuntarily always bite the nail, you can let the child appropriate relaxation, more attention, children always bite the nail situation will slowly improve. If children have a bad habit of biting their nails, this situation will also occur, some children do not have a special discomfort, is the habit of biting nails, this is a long-term formation of bad habits, to give children timely correction.