The condition called nail biting (or Onychophagia) is a common habit that many children and adults develop in response to stress, but most will outgrow it by the time they reach 30 years of age.

In a 1995 report titled “Operant Learning Principles Applied to Nail Biting”, Terry McClanahan wrote that approximately one-third of kids aged 7 – 10, as well as 44% of teens, 19 to 29% of young adults, and 5% of older people have the condition of nail biting.

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