The backbite is commonly referred to as a cavity or a cavity in the ground. Some people advocate orthodontic treatment after tooth replacement, others advocate early orthodontic treatment, but now most favor the latter, that is, whether or not there are genetic factors in children with pocket teeth, the sooner orthodontic treatment, the better, if the patient can cooperate. The etiology of pockets of teeth, there are genetic factors, developmental problems and bad habits. Genetic factors and developmental problems need not be mentioned, but bad habits are the most common and need parents’ attention: for example, incorrect breastfeeding posture and long-term incorrect bottle use, because of the wrong posture, the child will habitually stretch the jaw forward with force, stimulating the growth of the jaw, leading to the toddler’s hooded teeth. This period can be corrected quickly by wearing a removable orthodontic appliance. Some sensitive children in childhood are used to biting their lips, biting the lower lip can easily cause the upper jaw to protrude, on the contrary, biting the upper lip caused by malocclusion is pocket teeth, this period of children’s pocket teeth are mostly functional, correct the bad habits, wear the corresponding mobile orthodontic appliances orthodontic treatment. During the period of tooth replacement, there are bony and dental pockets. Dental pockets are caused by the upper teeth falling inward, and the orthodontic treatment can restore the upper teeth to the correct position; some children have bony underdevelopment of the upper jaw or overdevelopment of the lower jaw, and need to wear orthodontic appliances to promote the development of the upper jaw and inhibit the development of the lower jaw to correct the pockets. In adults, those with mild orthognathic requirements can wear fixed appliances for compensatory orthodontic treatment. Severe cases with high orthodontic requirements or bony deviations require combined orthodontic and orthognathic surgical treatment. Patients who have been orthodontically treated during the period of milk teeth should not be taken lightly, parents should carefully observe whether there is a relapse during the period of tooth replacement, and if there is a relapse, the second phase of orthodontic treatment is required, and there is rarely a relapse after the second phase of orthodontic treatment to completely correct the pocket teeth. A very small number of patients with abnormal jaw development due to genetic factors, even if the teeth do not jaw back, but the jaw bone is still overdeveloped, will need to undergo surgery after the adult. Most patients ask questions about the timing of orthodontic treatment, and parents of 5 and 6 year olds who come for orthodontic treatment ask whether their child will relapse if they have orthodontic treatment now. Generally speaking, in the case of the child can cooperate, the earlier orthodontic treatment the better, because the child is still in a period of growth and development, relatively early release of the upper and lower jaw anti-jaw relationship, conducive to the normal growth and development of the jaw. However, there is no guarantee that there will be no relapse, some children will relapse at the time of tooth replacement and can undergo second-stage orthodontic treatment. How long will it take to correct the problem, that is, the timing of the orthodontic treatment. This is a combination of the age of the child, the severity of the pocket teeth, the third is whether the doctor’s orders to wear on time (because most orthodontic appliances are movable, the patient can take off and wear), and the fourth is whether the child can follow up on time.