At what age in utero does calcification of all primary teeth begin?

Calcification of all primary teeth typically begins during the fourth fetal month. This process marks the initial stages of tooth development, during which the dental hard tissues start to mineralize. Typically, the timing of dental development is crucial in understanding dental anatomy and growth, as it lays the groundwork for the emergence of teeth after birth.

During the fourth month, the process of enamel and dentin formation progresses significantly, setting the foundation for the primary teeth. Understanding this timeline helps dental professionals assess dental development and identify any potential abnormalities in tooth formation.