Final answer:
The developmental cuticle on tooth enamel is created by keratinocytes from the stratum spinosum, serving as a protective layer similar to cuticles in other biological contexts.
Step-by-step explanation:
The primary or developmental cuticle is deposited on the surface of the tooth enamel by the keratinocytes in the stratum spinosum, which begin the synthesis of keratin. Just as plant leaves have a protective waxy cuticle and arthropods have a chitinous protective covering, the enamel of teeth has a cuticle layer known as the developmental cuticle. This layer protects the enamel's underlying dentine and pulp cavity but does not guarantee immunity against dental caries (tooth decay), which occurs when bacteria produce acids that demineralize the enamel.