The child’s replacement teeth have been lost for half a year and still not grown out may be related to the lack of calcium and vitamin D, premature loss of milk teeth and other conditions, you can use supplemental nutrition, surgical treatment and other methods to improve. 1. Lack of calcium or vitamin D: delayed growth of teeth may be related to the lack of calcium or trace elements. If the child’s body lacks calcium and vitamin D that promotes the growth of bones and teeth, the teeth do not have enough nutrients to develop and grow, and therefore erupt later. It is recommended that parents should pay attention to diet, consume more milk, seafood, beans and other calcium-rich foods, as well as can be taken under the doctor’s oral calcium gluconate, oyster calcium carbonate and other calcium supplements, while giving children appropriate exercise. 2 milk teeth lost too early: if milk teeth lost too early, due to chewing stimulation to the gingival mucosa keratinization hypertrophy, become tough, so that permanent teeth eruption difficulties. Due to the thickening of the gums and difficult to eruption of the teeth, can remove part of the gums to the cutting edge of the exposure, so that the teeth can be erupted. The child’s teeth have been lost for half a year has not grown out there may be other reasons, it is recommended that timely consultation, by the specialist judgment assessment, and give targeted treatment or treatment.