Orthodontic info
How many aligners will I get, and what decides the number?
The number of aligners comes from your treatment plan: the American Association of Orthodontists (AAO) says it varies with each person's orthodontic issues and the movements needed to correct them, so no count is known until your teeth are examined, scanned and planned.
On this page
Before treatment: the plan sets the first count
The first aligner count is worked out before any is made. The AAO's article on clear aligner therapy (opens in a new tab) says your orthodontist checks the teeth and jaws with X-rays, photos and digital scans, gives a diagnosis, and then designs a plan in aligner software detailing "which tooth moves where and in what order". Align, the maker of Invisalign, says its ClinCheck software maps that path from the first aligner to the last. A 2024 study in the Journal of Clinical Medicine found that the software's estimated count rose with an altered overjet or overbite, severe lower crowding or a more complex case, and varied widely within each category, so similar cases can differ. The AAO adds that dental work comes first because aligners are made to the exact shape of the teeth, so mention planned work before your digital scan.
During treatment: checks against the plan
During treatment your teeth are checked against the plan: you move to each new set on the schedule your orthodontist sets, and the AAO's guidance on clear aligners (opens in a new tab) recommends regular check-ups to make sure the teeth are moving appropriately. At those visits the AAO says your orthodontist can evaluate how the aligners fit and whether the teeth are moving as planned. That check matters because a plan is a prediction: a 2021 study of adults in the American Journal of Orthodontics and Dentofacial Orthopedics found certain tooth movements achieved and others not achieved predictably, even without known compliance issues. How closely the teeth keep up is called tracking, a term the post on how long Invisalign takes defines. Keep each check-in and mention any aligner that no longer fits closely, since those readings help decide whether the first count holds.
After the first series: when the total grows
The count you hear at the start covers the first series, and the total can grow afterward. In a 2018 study in the American Journal of Orthodontics and Dentofacial Orthopedics, adults who needed more aligners after their first series had a refinement series planned from the tooth positions they had actually reached. A 2021 study of adults in the same journal adds that more refinements may be needed to address problems created during treatment. Why another set can be needed is the subject of the page on Invisalign refinements. Ask at your consultation how a refinement would be handled in your plan, since the final total is known only at the end.
Questions
Frequently asked questions
Will I get all of my aligners at the first appointment?
Probably not. The AAO says your orthodontist will likely hand you a few sets at a time and more at routine appointments, and that some offices offer remote monitoring options that can minimize the number of appointments. Carvalho & Roth Orthodontics also offers remote dental monitoring between visits, so ask at your consultation how your sets will be handed out.
Does a higher aligner count mean treatment takes longer?
Generally, yes. The AAO says the number of aligners and the treatment time both vary with the movements needed, and Align says a minor fix for slight crowding or spacing needs fewer aligners and a shorter timeline than a complex bite correction. Your orthodontist explains your expected timeline at the consultation, since each set is worn on the schedule your orthodontist sets.
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