Nail biting can be stopped through behavioral therapy, psychotherapy, and habit correction training; there is no uniform so-called quick fix. 1. Behavioral therapy: Usually, you can put hot sauce or lemon juice on the child’s fingers to make the child feel disgusted when biting nails, which belongs to one way of aversion stimulation. 2. Psychological therapy: family members need to strengthen the child’s care and psychological guidance, avoid or eliminate the factors that make the child nervous, usually need to give the child a certain amount of companionship, and effective communication with the child. 3. Habit correction training: the family needs to make the child realize the harm of nail biting through education and guidance. Secondly, you can strengthen the child’s behavior of not biting nails by rewarding the material and fulfilling the wishes. For children with nail biting habit, it can usually disappear by itself with age, and a few of them will continue until adulthood. Therefore, you need to actively cooperate with your doctor for treatment to correct your child’s bad nail biting habit.