Why “Yes Set” Matters in Taking Medical Histories—And Why Online Forms Can Let You Down
As dental professionals, ensuring accurate medical histories is vital—not just for compliance, but for patient safety and treatment success. Yet as more practices shift towards IT solutions and online questionnaires, there’s a hidden psychological risk—especially when people fall into the “no set”.
What Is the “Yes Set” (and a “No Set”)?
In psychology, a yes set is a pattern where someone repeats the same response (usually “yes”) consecutively. After three yes responses, they are far more likely to say yes to a fourth, even if it’s different. This is anchored in our innate drive for consistency, one of the key principles identified by psychologist Robert Cialdini in his book Influence: The Psychology of Persuasion. Once we start responding in a certain way, we tend to keep going to remain consistent with ourselves.
The flip side, a no set, works the same but with repeated “no” responses—which is exactly what digital medical histories can unintentionally trigger.
This technique has real-world application in persuasion.
The Yes Set approach works by building a pattern of ‘Yes’ answers that gets the other person into a habitual response then you can slip in the question you really want a ‘Yes’ to.” This must always be done with ethics and integrity with the patients’ best interest at heart.
Influence experts refer to this as the Yes Ladder, where a series of small, agreeable questions lead naturally to a larger ask—or, inversely, a series of “no’s” leads to blindness to important truths (psychotricks.com).
Everyday Examples: Getting Agreement at Home
Using a yes set in real life can be startlingly effective to influence your spouse/ partner or children to do something putting out the rubbish or washing up their plates, when the questions are tailored to things you know the other person will agree with.
Example with a spouse or partner:
- “You’ve had a long day and a sit-down would be nice, wouldn’t it.” “Yes”
- “You prefer a coffee to tea don’t you?” “Yes”
- “You like your coffee in your favourite mug, don’t you?” “Yes”
Request: “Will you take the bins out now while I finish cooking supper?” “Yes.”
With a child:
- “Your favourite food is fish fingers and chips, isn’t it.” “Yes”
- “Given the choice, you’d rather eat your meal on the sofa in front of the TV, wouldn’t you.” “Yes”
- “You like it when I let you choose the film after tea, don’t you.” “Yes”
Request: “When you’ve finished eating, will you wash up your plate and cutlery? “Yes.”
In all cases, what matters more than the actual question is your certainty that the answer will be “Yes.”
Why Online Medical Histories Can Be a Problem
Now bring that same psychology into the dental surgery. Consider how a patient fills out an online medical history form. A generally healthy person clicks “No” repeatedly:
- No heart problems
- No diabetes
- No asthma
After only about 3 questions “No” answers, the no set kicks in. The response becomes automatic, and a patient might tick “No” to “Do you have any allergies?”—even if they do—simply because the pattern has taken over.
This is not dishonesty. It’s human nature. But it’s the opposite of what we need when safety is at stake.
How to Interrupt the “No Set” and Get the Truth
Pattern interrupts are essential to breaking the automatic response cycle. In a dental setting, this could be:
- Showing a diagram of the body and asking about each system individually.
- Building in a ‘break state’ or pattern interrupt.
- Changing from closed to open questions: “Tell me about the health of [ organ / body system] or any medications or supplements you take.”
- Most powerfully: having a face-to-face conversation when updating medical histories.
This conversational approach interrupts the “no set” and allows you to pick up on hesitation, tone, or body language that an online form can never reveal.
The Best Medicine Is Communication
Checking medical histories in person—with genuine interest and empathy—turns a tick-box exercise into a vital safety check and a trust-building moment. It prevents dangerous oversights, deepens patient relationships, and ensures you’re making clinical decisions with the most accurate information possible.
Takeaway
- The yes set shows how repeated responses influence later answers.
- Digital forms can unintentionally trigger a no set, hiding important health / medication or case history details.
- Use pattern interrupts and face-to-face reviews to protect accuracy and patient safety.
As Cialdini’s work and decades of behavioural science show, small patterns of agreement or disagreement can shape big outcomes. In dentistry, those outcomes should always favour accuracy, safety, and patient trust.
Ready to take your communication skills to the next level?
When you understand and apply evidence-based psychology in dentistry, you don’t just improve your conversations—you protect patient safety, reduce misunderstandings, and create a calmer, more collaborative practice environment.
Jane’s practice development, communication training and coaching blends proven psychological principles with practical, dental-specific strategies. The results?
- Greater patient trust and treatment acceptance
- Reduced stress for you and your team
- Enhanced professional reputation and career satisfaction
If you’d like to explore how better communication and psychological insight can transform your practice and wellbeing, get in touch today Jane@IODB.co.uk or book a SPEAK WITH JANE conversation through our website.
