Is Nail biting a mental illness?

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Tags

1. #especially
2. #common
3. #amongst
4. #control
5. #nails
6. #compulsive
7. #obsessive
8. #under
9. #related
10. #pathological
11. #disorders
12. #disorder
13. #considered
14. #biting
15. #forms
16. #classified
17. #impulse
18. #children