Research has shown that nail care and grooming can have psychological benefits, such as reducing stress and anxiety. A mother's influence on her child's nail care habits could be seen as a way of promoting relaxation, self-care, and hygiene.

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The phrase resists explanation; it demands visceralization . You don’t understand it—you feel it in your own cervical vertebrae.

If you're referring to a condition affecting the nails, there are several possibilities: