Almost every child has had the habit of finger sucking. Although sucking helps babies learn to coordinate their muscle movements early on, excessive sucking can nevertheless have a negative impact on their teeth. I. What is finger sucking Finger sucking is a manifestation of non-nutritive sucking by placing the thumb or other fingers in the mouth and applying sucking force. The sucking and biting habit often occurs in infancy, often outside of nursing time or during sleep, such as finger sucking, cheek sucking or lip sucking. Infants perceive the world through sucking, and even in fetal life they already start sucking on their fingers. Although this phenomenon gradually disappears with age. However, if a child is still accustomed to finger sucking after the age of 3, it means that the child has a behavioral drift and needs to be corrected by parents in time. Second, the causes of finger-sucking in children Insufficient parental care: parents are too busy at work, thus neglecting to accompany their children, which leads to the persistence of finger-sucking behavior. Regulation of bad emotions: children are not good at expressing themselves, and when they are excited or nervous, they instinctively suck their fingers to get a sense of security and satisfaction. Diverting attention: Hunger, illness, and other factors can cause physical discomfort in children, which can be relieved by finger sucking. If the above problems are not paid attention to in time, it may lead to the formation of the bad habit of finger sucking, which may endanger the normal growth of teeth and lead to malformation of teeth and even affect the growth of jaws and face, so it needs to be corrected in time and take the child for regular oral examination. Third, seize the orthodontic “golden” period, do not let finger-sucking affect the child’s “face” The teething period (3-5 years old) and the period of tooth replacement (6-12 years old): it is a good period to intervene in advance the malformed teeth that seriously hinder the growth and development, such as the milk teeth retrusion, so as to avoid affecting the child’s jaw development. 12-16 years old, usually 12-14 years old for boys and 11-13 years old for girls: the prime age for orthodontics in children, when most of the malocclusion problems can be treated. At this time, children’s permanent tooth roots are gradually developed, and they are at the peak of growth and development, so they can get twice the result with half the effort for most orthodontic treatment. However, there are individual differences in the growth and development of each child, and each child needs to be treated individually. Finger-sucking is not harmful for a short time, but it actually affects the baby’s “face” in a subtle way, so parents should correct the finger-sucking habit as soon as possible to add points to the baby’s face.