I. The Problem
The em dash is everywhere.
It appears in novels, essays, blog posts, business memos, academic papers, text messages, and, now most conspicuously, text generated by artificial intelligence. It has become the punctuation mark of choice for writers who want to signal sophistication, spontaneity, or intimacy. It is the mark that says: I am thinking as I write. I am interrupting myself. I am alive.
But the em dash is not alive. It is a mark. Like every mark, it has a purpose. When used well, it earns its place. When used poorly, it clutters. When used constantly, it becomes a tic.
The em dash is now used constantly. This essay argues that its overuse is a problem. The fact that it is common, accepted, permitted, and even encouraged does not make that overuse right.
The argument is simple: "is" does not equal "ought." The fact that something is done does not mean it should be done. The fact that a style guide permits a mark does not mean the mark should be used at every opportunity. The fact that a punctuation mark is popular does not make it correct. Convention is not a defense. Frequency is not a virtue.
II. The Is-Ought Distinction
In 1739, the philosopher David Hume observed that moral arguments often move from descriptive statements ("is") to prescriptive statements ("ought") without justification. Just because something is the case does not mean it should be the case. Just because people do something does not mean they should do it. This is the is-ought gap, and it applies to punctuation as much as it does to ethics.
The fact that the em dash is widely used does not mean it should be widely used.
The fact that The Chicago Manual of Style permits em dashes does not mean every writer should reach for them.
The fact that AI writing tools produce em dashes at a high rate does not mean human writers should imitate them.
The fact that readers have become accustomed to em dashes does not mean the mark is serving them well.
The is-ought gap cuts through every appeal to convention. "Everyone does it" is not an argument. "It's allowed" is not an argument. "It's been done this way for decades" is not an argument. The only argument that matters is this: Does this mark, in this place, serve the sentence? If the answer is no, the mark should go, regardless of what Chicago says.
III. How the Em Dash Became Ubiquitous
The em dash has not always been this common. Its rise can be traced through several cultural and technological shifts.
First, the rise of academic and journalistic prose. In the twentieth century, as nonfiction writing became more conversational, writers reached for marks that mimicked the rhythms of speech. The em dash, which signals interruption and asides, was a natural fit. It allowed writers to break the formality of the period without losing the authority of the sentence. By the late twentieth century, the em dash had become a marker of sophisticated, "voice-driven" prose.
Second, the rise of digital publishing. Blogs, online magazines, and self-published books democratized writing. Without copyeditors, many writers defaulted to the em dash as a way to add emphasis or rhythm. Word processors made the mark easy to insert by automatically converting two hyphens. The em dash became the punctuation of the amateur who wanted to sound professional.
Third, the rise of social media. Twitter, Facebook, and Instagram trained writers to compress their thoughts. The em dash allowed a single sentence to carry multiple ideas, including a setup, an aside, and a punchline, within a character limit. It became the mark of the clever post, the witty caption, and the hot take.
Fourth, the rise of AI writing. Large language models trained on vast collections of human text learned that em dashes appear frequently in "good" writing. They reproduced the pattern. Now, when a user asks ChatGPT to write an essay, a cover letter, or a eulogy, the output is often dense with em dashes, sometimes containing one in nearly every sentence. The mark has become a perceived signature of machine-generated text. Because AI writing is now everywhere, the mark is everywhere.
The result is a punctuation mark that no longer signals anything. It has become noise.
IV. Why Em Dashes Are Overused
The em dash is overused for several reasons, each of which reveals a deeper problem.
1. It substitutes for the period. Writers use em dashes to avoid the finality of a full stop. A period says: This thought is complete. An em dash says: This thought is complete, but I have more to say. The em dash lets writers avoid commitment. It lets them keep the sentence open, the options alive, and the rhythm going. But a sentence that never ends is a sentence that never lands. The period is the most powerful mark in English. The em dash is often a way to avoid using it.
2. It substitutes for the colon. Writers use em dashes to introduce explanations, examples, or lists. A colon says: Here is what I mean. An em dash says: Here is what I mean, sort of, but I am not committing to the structure. The colon is precise. The em dash is vague. When writers use the em dash where a colon belongs, they weaken the sentence's logic.
3. It substitutes for the comma. Writers use em dashes to set off parenthetical phrases. A pair of commas says: This is an aside. A pair of em dashes says: This is an aside, but a dramatic one. The problem is that when every aside is dramatic, no aside is dramatic. The em dash inflates. The comma understates. Most asides should be understated.
4. It substitutes for thought. Writers use em dashes to mimic the rhythm of thinking: the pause, the shift, and the correction. But thinking is not the same as writing. Writing is thinking made clear. The em dash often disguises unclear thinking as spontaneous prose. It lets the writer avoid the work of deciding what the sentence actually means.
5. It is a status marker. Writers use em dashes because other writers use em dashes. The mark signals membership in a certain kind of writing culture: literary, sophisticated, and in the know. But status markers are not arguments. The fact that a mark signals sophistication does not mean the mark is sophisticated. It may simply mean the mark is fashionable.
V. What Em Dashes Do Well
None of this means the em dash should be abolished. The mark has legitimate uses.
1. Abrupt interruption. When a sentence is genuinely interrupted by a speaker, an event, or a realization, the em dash may be the right mark. In dialogue, it can show that a speaker has been cut off before finishing a thought. In that setting, it does what a period, comma, or colon cannot do. It signals that the sentence has broken off.
2. Emphasis before a reveal. When a writer wants to set up a reveal, the em dash can be effective. It can create a pause that a comma would rush and a period would break. Used sparingly, it can give the final word or phrase the weight it deserves.
3. Parenthetical emphasis. When an aside needs more emphasis than commas would give but less separation than parentheses would create, a pair of em dashes can serve the sentence. The dashes mark the aside as sharper and more forceful than commas would.
4. Dialogue interruption. In fiction and drama, the em dash can be essential. Characters interrupt one another. Sentences break off. The em dash captures what speech actually does.
These are real uses. They are also relatively rare. Most em dashes in most writing are not doing any of these things. They are substituting for a period, a colon, or a comma.
VI. The Is-Ought Argument Applied
Now for the central argument.
The fact that the em dash is used in these ways does not mean it ought to be used in these ways.
The fact that The Chicago Manual of Style permits em dashes does not mean Chicago recommends them at the rate they are used.
The fact that AI writing tools produce em dashes does not mean human writers should reproduce them.
The fact that readers tolerate em dashes does not mean readers benefit from them.
The fact that em dashes are common does not mean they ought to be common.
This is the is-ought gap, and it exposes every defense of em dash overuse as a nonargument. "It's standard" is not a defense. "It's allowed" is not a defense. "It's what everyone does" is not a defense. The only defense that matters is this: Does this mark, in this sentence, serve the reader?
Most of the time, the answer is no.
VII. What to Do Instead
The remedy is not complicated.
Use the period. When a thought is complete, stop. The period is the most underused mark in contemporary writing. It is also the most powerful. A period says: This matters. Sit with it. Em dashes rarely say that.
Use the colon. When the second half of a sentence explains the first, use a colon. It is precise. It is clean. It does what the em dash often tries to do, but better.
Use the comma. When two clauses form one continuous thought, use a comma where grammar allows it. It is quiet. It is unobtrusive. It lets the sentence flow without inflating it.
Use the semicolon. When two independent clauses are closely related, use a semicolon. It is elegant. It is relatively rare. It earns its place.
Use the em dash only when nothing else works. The em dash is a specialist tool. It should be used the way a surgeon uses a scalpel: rarely, precisely, and only when the situation demands it.
VIII. Conclusion
The em dash is not wrong. Its overuse is.
The fact that it is common does not make it right. The fact that it is permitted does not make it necessary. The fact that it is fashionable does not make it good.
This is the is-ought gap applied to punctuation. It matters because punctuation is not decoration. Punctuation is meaning. Every mark a writer uses is a decision about how the reader will experience the sentence. The em dash, used well, is a tool. Used constantly, it is a distraction.
The remedy is simple: write with the period. Write with the colon. Write with the comma. Reach for the em dash only when nothing else will do.
The em dash is not the enemy. Its overuse is. The first step toward fixing that overuse is to stop pretending that "everyone does it" is a reason.
It is not.
It never was.