Em-Dash Overuse: The Universal Connector Crutch
The em dash can replace a comma, a colon, parentheses, or a full stop — which is exactly why AI drafts reach for it constantly. Past two or so per 300 words, every sentence starts to share the same interrupted rhythm.
Why AI writes it: When any connector fits, the dash is the statistically safest choice, so models over-produce it. Human writers vary punctuation because they hear the rhythm; models repeat what scores well token by token.
See it flagged live
Before & after
Before
The rollout — which took three weeks — went smoothly — surprisingly so.
After
The rollout took three weeks and went surprisingly smoothly.
Before
One metric matters — retention — and we ignored it.
After
One metric matters: retention. We ignored it.
How to fix it
- 1Budget roughly two em dashes per 300 words; zero in short copy.
- 2Downgrade asides to commas or parentheses; promote real breaks to full stops.
- 3Keep the dash for genuine interruption or emphasis — the job only it can do.
Related patterns
Frequently asked questions
▸Why a budget instead of a ban?
The dash is a great tool at low frequency. SlopTrim only flags dashes once a draft exceeds its budget (about 2 per 300 words), and flags every occurrence so you can choose which ones to keep.