Nail biting -- like skin picking and hair tending -- stems from an evolutionarily adaptive behavior: grooming. But in "pathological groomers," as they're known in in the world of psychiatry, that healthy urge goes haywire.
Nail biting -- like skin picking and hair tending -- stems from an evolutionarily adaptive behavior: grooming. But in "pathological groomers," as they're known in in the world of psychiatry, that healthy urge goes haywire.
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