At what age is calcification of primary teeth expected to be completed?

The correct choice is the age at which calcification of primary teeth is expected to be completed, which is around 12 months. This process typically begins shortly after birth and involves the development of the primary (deciduous) teeth, culminating in the complete calcification of all primary molars and incisors by the age of 1 year.

At approximately 12 months, most children will have fully calcified primary teeth, including the central incisors, lateral incisors, canines, and first molars. This marks a significant milestone in dental development and is important for subsequent dental health. The primary teeth assist in nutrition, speech, and the development of the jaw, paving the way for adult teeth.

The others in the list represent stages in dental development that occur either too early or too late in relation to the complete calcification process. For instance, while calcification begins early—around 6 months—complete calcification is typically achieved by 12 months. Similarly, 18 or 24 months would be considered delayed for the entire set of primary teeth to be fully calcified, as by 24 months most children will also have erupted their primary teeth. Thus, 12 months stands as the accurate timeframe for the completion of calc