Final answer:
The detail that provides clues to the essay's topic is 'a new alphabet'. The essay will discuss a proposed change or improvement to the current alphabet system.
Step-by-step explanation:
The detail that provides the reader with clues to the essay's topic is a new alphabet. This detail suggests that the essay will discuss a proposed change or improvement to the current alphabet system. In the passage, the author criticizes the inadequacy of the current alphabet, likening it to patching and plugging old dental relics. The mention of a new alphabet indicates that the essay will explore the need for a different and more effective alphabet system.
Learn more about The topic of this question and answer is understanding the main idea of a passage.