Final answer:
The question inquires about the frequency at which cementum and enamel fail to meet during tooth development. Since a specific percentage is not provided, the fact remains that it is not always guaranteed that these structures will meet perfectly. Clinical studies provide more accurate figures based on observations.
Step-by-step explanation:
The question pertains to the meeting point between two structures of a tooth: the cementum and the enamel. Normally, these two components should meet exactly at the cementoenamel junction, ensuring a seamless transition between the protective layers of the tooth. However, this ideal meeting does not occur 100% of the time. Although an exact percentage is not specified in the provided materials, variations in dental anatomy, and discrepancies due to different factors during tooth development, can lead to instances where cementum and enamel do not meet properly. Clinical studies and dental textbooks might offer specific percentages based on observed cases or scientific studies.
When cementum and enamel do not meet properly, it might cause a gap that could potentially lead to dental issues such as increased sensitivity or a higher propensity for decay at the exposed dentin area.