Deciduous Tooth: These teeth are called “reborner teeth” “temporary teeth” or “baby teeth”, as well as “primary teeth” and are the 1st teeth in the growth of human beings and other mammals. In several countries in Asia they are called “fall teeth” since they will ultimately fall out, while in almost all European nations they called them “milk teeth”. These teeth grow during the embryo stage of growth and burst forth, becoming seen in the mouth, during early infancy. They are normally lost and substituted by permanent adult teeth but in the absence of permanent replacement, they may remain functioning for many years. They start falling out around 6 years of age.