Any of a set of early temporary teeth in children or young mammals which fall out as the permanent teeth  is called milk teeth

Milk teeth is the set of early teeth in small children that begin to show after 6 months . It is also called deciduous teeth.  Milk teeth are very important because it helps babies in chewing and speech development. It also helps the jaw to develop.Between the ages of 6 to 7 the root of the milk teeth will start to dissolve it will fall out. After that adult teeth or permanent teeth will start growing and then replace the milk teeth in the child's mouth.