Question

how many deciduous teeth are in a primary dentition and which tooth and at which ages does the first tooth erupt?

Answer 1

Primary dentition refers to the eruption of first teeth in the oral cavity during infancy. The first teeth that erupt are known as deciduous teeth or milk teeth. These teeth are temporary teeth and are replaced by permanent teeth in childhood.
In a primary dentition, there are 20 deciduous teeth - 10 in upper arch and 10 in lower arch.
The process of eruption of first teeth starts in infancy. Usually the first teeth eruption starts around 6 months. But it may vary in some babies and begin as late as 1-1.5 years. The process of deciduous teeth eruption is completed around 2-3 years.
The first teeth to appear in oral cavity are mandibular central incisors. They help in cutting of food.