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The great clear aligner consensus (2025)
Stephane Reinhardt
Oct 13, 2025
Do aligners work as well as braces? When do they shine, and when should we reach for auxiliaries or even fixed appliances?
To find out, an international group of orthodontic experts came together to settle some of these long-standing questions about clear aligner therapy (CAT). At The CLEAR Institute, we love when science meets the clinic.
Researchers used something called a modified Delphi method. It sounds fancy (and it is), but it’s actually just a very smart, structured way to reach agreement among experts.
The result? After months of review, three rounds of anonymous voting, and a lot of careful thinking, 23 experts reached consensus on 22 statements about clear aligners. Their findings give us a practical, evidence-based roadmap for everyday aligner dentistry.
Let’s make it simple, fun, and useful for your daily practice.

Key takeaways at a glance
Class I, non-extraction, mild to moderate crowding: clear aligners achieve outcomes comparable to fixed appliances.
Open bite management: aligners work well, mainly through incisor extrusion rather than molar intrusion.
Tooth movement: aligners move primarily by crown tipping, not bodily movement—auxiliaries are often necessary.
Distalization: up to 2.5 mm for upper first molars is realistic.
Refinements: predictable when planning low-predictability movements; they’re part of the process, not a failure.
Patient experience: less pain and better oral health-related quality of life during treatment.
Oral hygiene: fewer white spots, less plaque, and less gingival bleeding than with fixed appliances.
Growing patients: clear aligners expand dentoalveolarly, but rapid palatal expanders still produce more skeletal change.
Extraction cases: fixed appliances provide better torque control, occlusal contacts, and alignment detail.
Chair time: reduced chair time is a genuine clinical advantage.
If you only read this section, you’re already planning better cases 😊.

💡 What’s a Delphi?
Imagine trying to choose a restaurant with 20 dentists. Everyone’s hungry, everyone has an opinion, and nobody wants to offend the vegan dentist.
A Delphi process is how scientists prevent that kind of chaos, but for research. You gather a group of experts, ask them the same question (for example: “How predictable is molar distalization with clear aligners?”), and they answer anonymously. Then you share the group’s answers, without names, and ask again. Round after round, opinions converge. Not through peer pressure, but through logic.
A modified Delphi is the same thing… with caffeine. Instead of starting with open questions, researchers present clear statements like:
“Clear aligners can achieve outcomes comparable to braces in mild to moderate crowding.”
Experts rate each one, comment, and repeat until they reach a reliable consensus.
It’s like asking 23 top chefs whether pineapple belongs on pizza. They don’t argue, they quietly rate it until, by round three, they finally agree:
🍍 “Okay fine, pineapple is acceptable… if you replace the dough with a waffle, and the cheese with vanilla ice cream.”
That’s the Delphi method: science without the shouting, teamwork without the ego, and a reliable way to find clarity in a buffet of opinions

What they did, in simple terms
A steering committee selected six clinical subtopics:
Efficacy and efficiency
Patient experience
Side effects
Growing patients
Extraction cases
Periodontal health
They reviewed the literature, drafted 25 statements, and asked 23 panelists (all experienced aligner experts) to anonymously rate their agreement.
Three rounds later, consensus was reached on 22 of those statements, meaning the experts finally agreed on what aligners can truly do, what they can’t yet do well, and where more research is needed.
What we think: the CLEAR perspective
1. Aligners are excellent for the right cases
Class I, non-extraction, mild to moderate crowding, no pure vertical movements: this remains the sweet spot. Aligners perform beautifully when movements are planned within predictable limits. Open bites can be treated effectively, but remember: the correction comes mostly from incisor extrusion, not molar intrusion.
If your ClinCheck looks like a magic show, it probably is. Plan real biomechanics, not wishful thinking.
2. The patient experience advantage is real
Less discomfort, easier hygiene, fewer emergencies, and happier patients. That combination matters. We don’t practice orthodontics in a vacuum: patient comfort and compliance are essential. When the appliance itself supports both, we pay attention.
3. Auxiliaries are not optional, they’re strategic
Aligners move teeth primarily by tipping. When you need bodily control, like canine rotation, torque, or molar distalization, auxiliaries make the plan predictable. Attachments, elastics, buttons, power arms, or precision cuts aren’t “cheats.” They’re smart biomechanics in action.
4. Refinements are normal, too many are not
Planning unpredictable movements means refinements are part of your plan, not a surprise. However, excessive refinements often point to unrealistic initial expectations. The data show that one in six aligner patients may need conversion to fixed appliances. That’s not failure, it’s leadership. Your patient hired you for results, not loyalty to plastic.
5. Periodontal patients benefit from aligners, but within limits
For minor migrations in periodontally stable patients, clear aligners are ideal. For major bodily movements, tread carefully. Control the force, coordinate with the periodontist, and prioritize health over speed.
6. Growing patients still need skeletal tools
Aligners expand primarily dentoalveolarly. If you’re aiming for true skeletal expansion, a rapid palatal expander remains the gold standard. Aligners can complement, not replace, orthopedic devices, especially for developing Class II or transverse discrepancies.
What we will do at The CLEAR Institute
This consensus reinforces what we’ve been teaching for years: clear aligner success comes from knowledge, not recipes. We’ll continue refining our training so dentists can:
✅ Use predictability scoring before submitting a plan: rate movements for biological feasibility and anchorage needs.
✅ Plan auxiliaries early, especially for rotation, distalization, or expansion beyond tipping range.
✅ Treat open bites with intention, controlling vertical dimension and retention.
✅ Approach extraction cases realistically, choosing hybrid or fixed mechanics when needed.
✅ Manage periodontal cases conservatively, focusing on controlled, light forces.
✅ Value chair time as a clinical resource, not just a scheduling metric.
In short, we’ll keep simplifying what’s complex: because confidence comes from clarity.
What to look for next
Research still has work to do. We need stronger studies on:
True treatment duration comparisons
Long-term stability of aligner outcomes
Skeletal effects in growing patients
Root resorption mechanisms
Biomechanics in periodontally compromised patients
At The CLEAR Institute, we track this evolving science so you don’t have to. We teach what’s proven, explain what’s emerging, and help you navigate the gray areas with confidence.

The CLEAR conclusion
Clear aligners have evolved from a cosmetic option to a reliable orthodontic tool. But like any tool, success depends on how you use it. This consensus study proves what we’ve always believed: aligners are predictable, efficient, and enjoyable to work with when you respect their biomechanics.
No magic. No cookbook. Just principles, planning, and passion for great dentistry.
Because at the end of the day, confidence with clear aligners is closer than it appears.
It's time to Make the MOVE.
Want to go further?
👉 Feel free to share this article with colleagues or peers who might find it intriguing.
Let’s stay at the forefront of advancements in clear aligner technology together!
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