Onychophagia (NB) is a self-grooming behavior, and a chronic habit of nail biting also called body focused repetitive behaviors (BFRBs). It is disorders in which the individual damages his or her appearance or causes physical injury. It may lead to significant physical and psychosocial problems, also having a negative impact on quality of life. It is commonly seen in children and young adult. The present paper focuses on the classification, etiology, epidemiology, and complications. It also throws lights on prevention, prognosis and management of NB.

Keywords: Onychophagia, Nail biting, A Body focused repetitive behaviors, Self-grooming behaviors