Nail biting is a more common problem than most people realize.  It is so common, in fact, that it has its own medical terminology.  Nail biting is called onychophagia.   This bad habit is more common in children than it is in adults.  Nearly fifty percent of children between the ages of ten and eighteen admit to biting their nails.  It is important to arm children with the tools necessary to stop nail biting.  M...