The loss of milk teeth has not been growing new teeth may be due to early loss of milk teeth, nutritional deficiencies, developmental abnormalities, etc., you can go to the hospital to take x-ray film to clarify the cause of the disease, the cause of the treatment, such as eruption guide surgery, nutritional supplementation, surgical treatment, and so on. 1. For early loss of milk teeth, due to caries, trauma and other factors, milk teeth fall out too early, the gingival mucosa in the missing teeth area is thickened by keratinization caused by friction with food for a long period of time, which increases the resistance to the eruption of permanent teeth, so we can wait for a period of time to let the permanent teeth erupt on their own, or consider eruption guide surgery, so as to let the teeth grow out. 2. For those with nutritional deficiencies, the lack of calcium due to picky eating, anorexia and other factors, resulting in the failure of permanent teeth to erupt, can be supplemented with calcium, eat more calcium-containing foods, more sunshine, to promote the absorption of calcium. 3. For those who have abnormal development, the direction of eruption of permanent teeth is abnormal, and they are blocked by the neighboring tooth germs and can not erupt, x-ray examination can be carried out, and appropriate treatment can be carried out. The loss of milk teeth has not been growing new teeth may also be due to other reasons, you need to go to the hospital for consultation, under the guidance of a professional doctor on the cause of the treatment.