The child is 7 years old and the teeth have not grown out after half a year, which may be related to calcium deficiency or thickening of the gums. It is recommended to make timely calcium supplement, if necessary, surgical eruption and other symptomatic treatment, and at the same time to strengthen the nursing care, to correct the bad habits and so on. 1. Calcium deficiency: If a child is deficient in calcium, it may lead to late eruption of permanent teeth. It is recommended to adjust the dietary structure and eat more foods rich in protein and calcium, which can help replenish the nutrients of the body and promote the smooth eruption of teeth. If necessary, calcium carbonate granules can be taken as prescribed by the doctor for calcium supplementation. 2. Gingival injury and thickening: Due to the loss of milk teeth, the gums are thickened by long time friction due to long time chewing of food, which inhibits the eruption of permanent teeth. If necessary, the thickened gums can be surgically cut to help the permanent teeth erupt. Medical treatment and daily care should be strengthened, such as correcting bad habits, regular work and rest, going to bed on time and getting up on time; maintaining oral hygiene, brushing and rinsing; and eating a reasonable diet, which can help to improve physical fitness and promote the eruption of teeth. The child is 7 years old, the replacement of teeth for half a year has not grown out, there may be other reasons, it is recommended to improve the examination, under the guidance of a professional physician standardized treatment, so as not to delay the condition.