![]() ![]() Freud: Nail biting is caused by arrested psychological development at what Freud called the oral stage of psychosexusal development.Here’s a list of some of the theories that have been advanced for the causation of nail biting: Nobody really knows what causes nail biting. A working definition of nail biting is that is a matter of putting one or more fingers in the mouth and biting on nail with your teeth. ![]()
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