Before you go ahead an start applying yicky substances to the fingernails, have you considered that maybe your son isn't just mimicking Xepherys but perhaps instead is stressed out? Nail biting, like thumb sucking, can be a response to stress.
As you likely already know, kids can be worriers too. This might be a tension habit. Forcing it to an end might make matters worse.
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
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