Ключевые слова: abuse, adult, anguish, anxiety, anxious, bad, bipolar, bite, biting, bleeding, burden, care, caucasian, chew, chewing, close, closeup, compulsive, damage, depression, disease, disfigure, disgusting, distress, finger, fingernail, fingers, gross, habit, habitual, hand, harm, hurt, injury, lifestyle, medical, nail, nailbiter, nailbiting, nervous, onychophagia, onychophagy, pressure, problem, ruin, strain, thumb, ugly, up, worry,