Cap Stage:
This occurs for the primary dentition between the ninth and the tenth week of prenatal development during the foetal period. This stage is characterised by the continuation of the ingrowth of the oral epithelium into mesenchyme. This stage marks the beginning of histodifferentiation. At the end of this stage, the three embryological structures (the dental papilla, dental follicle and the enamel organ) are considered together to be the tooth germ.