It is normal for children to change their teeth at the age of six and there is no need to worry. Children’s milk teeth usually from six months to two and a half years of age completely erupted, and reached the age of six years, the milk teeth began to fall out, the permanent teeth began to erupt, occurred between the milk teeth and permanent teeth alternation, so at the age of six years of age to appear the situation of tooth replacement is normal. In general, the first teeth to fall out are the upper and lower premolar teeth, and then the cuspids and molars, which can be completely lost at the age of 12, so there is no need to worry. Under normal circumstances, the milk teeth fall out first and the permanent teeth erupt later, but if the permanent teeth have erupted but the milk teeth have not fallen out or the permanent teeth have not erupted and the milk teeth have not been replaced, it is necessary to go to the hospital, according to the situation for the removal of milk teeth and other treatments so as not to affect the development of the teeth in the later stages.