Ectomesenchymal cells closer to the outer margin of the enamel organ will differentiate into:
Ectomesenchymal cells closer to inner margins of enamel organ will differentiate - Dental papilla 
Ectomesenchymal cells closer to outer margins of enamel organ will differentiate - Dental follicle.
Dental papilla.
Dental follicle.
Dental sac.
None.