Seven-year-old boy’s upper incisors fell out half a year new teeth did not grow out may be lack of nutrition, teeth fall out earlier, teeth growth is hindered caused by, can be improved through dietary modification, surgical treatment and other methods. 1. Lack of nutrition: the lack of calcium and vitamin D, two nutrients may lead to the child’s poor dental development, the phenomenon of delayed growth of new teeth. Parents can give their children more food rich in calcium and vitamins to give children enough nutrients to promote the growth of children’s teeth, such as milk, fruits, meat, vegetables and so on. 2. Early tooth loss: the child’s incisors fall out earlier, the new teeth have not yet reached the time of growth, parents need to wait patiently, when the child’s body has enough nutrients, and tooth growth and development to a certain stage, the teeth will come out. 3. Tooth growth obstruction: after the child’s incisors fall out, due to the gums are thicker, may lead to tooth growth obstruction, there is a delay in tooth growth, this time you need to take the child to the hospital for treatment, by professional doctors to take the relevant surgery to improve the growth of the teeth. If your child’s incisors have been missing for half a year and no new teeth have appeared, it is recommended that you take your child to the stomatology department of a hospital for the appropriate checkups and follow the doctor’s instructions for treatment.