At the age of five and a half, the loss of teeth is not a calcium deficiency, it is a normal loss of milk teeth. 1. Milk teeth and jaws are built at the age of 2.5 years, the normal time of milk teeth loss starts at about 6 years old, 5.5 years old belongs to the category of normal time, which is the normal development of teeth. If there is premature tooth loss or retained milk teeth, it is necessary to go to the hospital for examination and disposal. 2. 6~12 years old is the period when children’s milk teeth and permanent teeth replace the jaws, the loss of teeth is a normal dental development, but you need to go to the hospital for regular checkups to observe the eruption and loss of teeth, in order to prevent congenital missing teeth or other situations. In case of early loss of milk teeth, a gap retainer is needed to reserve a place for the eruption of permanent teeth, or in case of late eruption of permanent teeth, an incision is needed to assist the eruption. Medical consultation is recommended.