Final answer:
Cementum and enamel meet 100% of the time at the cementoenamel junction.
Step-by-step explanation:
In tooth development, cementum and enamel meet at the junction of the crown and the root of the tooth. This junction is known as the cementoenamel junction (CEJ). The cementum covers the root of the tooth, while the enamel covers the crown.
So, we can say that cementum and enamel meet 100% of the time at the cementoenamel junction.
For example, in a molar tooth, the enamel covers the top part of the tooth, while the cementum covers the bottom part of the tooth, creating the junction between the two layers.