BJ Fogg had a toothbrush in his hand and a theory in his head. The Stanford behavior scientist had spent years studying how technology companies persuade people to click, scroll, and buy. Now he wanted to answer a different question: why do humans fail so spectacularly at changing their own behavior?
His experiment was absurd on purpose. He would floss one tooth per night. Not all of them. Just one.
He anchored it to a behavior he already did — brushing his teeth — and celebrated immediately afterward. A small fist pump. A whispered “good job.” Something to make his brain register a tiny victory.
Within a week, he was flossing all his teeth. He hadn’t planned to. He hadn’t set a goal to. The habit just grew — because the entry point was so small that his brain never had a reason to resist it.
The equation that explains why you quit the gym
Fogg built his career on a deceptively simple model. Behavior, he argues, happens when three things converge at the same moment: motivation, ability, and a prompt.
He calls it the Fogg Behavior Model, and the key insight is this — motivation is unreliable. It spikes on January 1 and crashes by January 19. If your behavior change strategy depends on staying motivated, you’ve already lost.
But ability is something you can control. Make the behavior easy enough, and even low motivation will carry you through. That’s the logic behind one tooth. You never wake up too tired, too busy, or too demoralized to floss a single tooth.
“People change best by feeling good,” Fogg has said, “not by feeling bad.” This is the part most behavior change programs — corporate and personal — get exactly backward. They set ambitious targets, assume motivation will hold, and then blame the individual when it doesn’t.
Sixty thousand people and a five-day program
In 2011, Fogg launched a free five-day coaching program called Tiny Habits. Participants picked three small behaviors, anchored each to an existing routine, and practiced them for a week.
The results were startling. By 2020, more than 60,000 people had gone through the program, and Fogg’s lab at Stanford had collected data showing that the method worked across demographics, personality types, and goals.
The success rate wasn’t driven by the size of the habit. It was driven by the consistency of the trigger. People who anchored their tiny habit to a specific existing behavior — “After I pour my morning coffee, I will write one sentence in my journal” — stuck with it at dramatically higher rates than people who relied on time-based cues or vague intentions.
Jennifer Aaker, a behavioral scientist at Stanford’s Graduate School of Business, has noted that Fogg’s work upended a core assumption in the field. “For decades, we assumed behavior change was about willpower and information,” she said. “Fogg showed it’s about design.”
Silicon Valley paid attention
Fogg’s Stanford lab, the Behavior Design Lab, became a quiet engine of influence in Silicon Valley. His former students include the co-founders of Instagram and the creators of some of the most addictive apps on your phone.
The irony isn’t lost on Fogg. The same principles that help you floss one tooth also help tech companies keep you scrolling at midnight. Tiny prompts. Low friction. Immediate reward. The architecture of behavior change is morally neutral — it works whether the goal is healthy or exploitative.
But the workplace application is where the model gets genuinely useful.
Think about every initiative you’ve tried to roll out on a team. A new CRM workflow. A weekly feedback habit. A daily standup. Most of these fail not because people disagree with them, but because the behavior is too big for the motivation available.
Fogg’s model says: shrink the behavior until it’s laughably small. Then anchor it to something that already happens.
The manager who changed one question
Consider a real example. A director at a mid-size tech company wanted her managers to give more frequent feedback. She’d tried training sessions, reminder emails, and quarterly nudges. Nothing stuck.
Then she applied Fogg’s framework. Instead of asking managers to “give more feedback,” she asked them to do one thing: after every one-on-one meeting, ask the question “What’s one thing that went well this week?”
That’s it. One question. Anchored to an existing meeting. Tiny enough to never skip.
Within six weeks, the question had become automatic. And something unexpected happened — managers started adding follow-up questions on their own. “What was hard?” “What do you need from me?” The feedback conversations grew organically, not because anyone mandated a longer script, but because the tiny habit created an opening that felt natural to expand.
This is exactly what happened with Fogg’s tooth. You don’t need to plan the expansion. You just need to nail the start.
Why celebration matters more than you think
The strangest part of the Tiny Habits method is the celebration. Fogg insists on it. After you complete your tiny behavior, you do something — anything — that creates a small positive emotion. A fist pump. A smile. Saying “I did it” under your breath.
This isn’t motivational fluff. It’s neuroscience.
Fogg’s research shows that emotions create habits — not repetition. The speed at which a behavior becomes automatic is directly tied to the positive emotion you feel immediately after doing it. Repetition without emotion creates routine at best. Emotion creates compounding identity change.
James Clear, who built on Fogg’s work in Atomic Habits, echoed this principle. “Every action you take is a vote for the type of person you wish to become,” Clear wrote. Fogg would add that the vote only counts if it feels good when you cast it.
The smallest possible version of what you want
If you manage a team and you want to change a behavior — any behavior — Fogg’s method offers a brutally practical starting point.
First, identify the behavior you want. Then shrink it until it sounds ridiculous. “Read industry news daily” becomes “read one headline after opening your laptop.” “Document your work” becomes “write one bullet point before closing your browser.” “Coach your direct reports” becomes “ask one question in your next one-on-one.”
Second, anchor it to something that already happens. The anchor has to be specific, consistent, and already automatic. “After I sit down at my desk” works. “Sometime in the morning” does not.
Third, celebrate. This is not optional. Your brain needs the signal that something good just happened, or the behavior won’t wire in.
Fogg started with one tooth because he understood something most productivity gurus don’t. The size of the habit doesn’t determine its impact. The consistency of the trigger does.
One tooth became a full mouth. One question became a feedback culture. One tiny behavior, placed in the right spot with the right emotion, can reshape how an entire team operates.
You don’t need a transformation initiative. You need a toothbrush.