Nail biting should not be dismissed merely as a bad habit. According to experts it is more than a bad habit. It can also be a symptom of obsessive compulsive disorder. There are various reasons for biting the nails. You may bite your nails when you are nervous, stressed or bored. Regardless of the underlying cause of this unhealthy habit, it makes your nails ugly and prevents them from growing naturally. Here is an interesting video that will show you how to stop biting your nails and grow them out.