Retainers after aligners: the cost nobody quotes you

Aligner treatment does not end when the last tray comes out. Teeth drift back toward where they started, so the course ends with a retainer — and a retainer is a purchase you repeat, not a purchase you make once.

That recurring cost is missing from almost every headline price in this market, and over a few years it can exceed the price of the aligners.

What the published retainer prices are

AlignerCo publishes retainer prices on its own site, read on 24 September 2026. A one-time set was listed at $125, struck through from $150, described as including an impression kit the page values at $59.99, the clear retainers themselves and a carrying case. A subscription was listed at $110 for the first order and $100 for each further set, delivered every six months.

Align supplies its own retainers at the end of Invisalign treatment: its material describes patients receiving "custom-made Vivera™ retainers that are crafted using the same technology as your Invisalign aligners, or another retainer brand". It publishes no price, in keeping with the rest of its pricing, which is set by the treating doctor.

AlignerCo's page also quotes ranges for competing products — "$150 – $500" for other clear retainer brands and "$150 – $600" for metal ones — as part of a comparison in its own favour. Those are a seller's claims about rivals it does not sell, and we repeat them as exactly that.

Why replacement is the real number

Take the subscription figure at face value and the arithmetic is simple: $110 for the first set, then $100 for each one after, delivered every six months — $210 in the first year and $200 a year from then on. Against an all-day aligner plan listed at $725, the running total passes the price of the treatment during the fourth year: $210, $410, $610, $810.

That is not an argument against retainers. It is an argument for putting them in the budget at the start, because the alternative — stopping when the retainer wears out — is how people end up shopping for a second course of aligners.

Retainers also get lost, sat on and, like trays, warped by hot water. A replacement bought because you melted one in the dishwasher costs the same as a replacement bought on schedule.

Where retainers sit in the total

It is worth writing the whole thing out once, because the headline price is the smallest part of it for anyone who keeps their teeth straight for a decade.

A course bought at a listed $725 is the entry. Add an examination and X-rays before it, which nobody's aligner price includes. Add the first retainers at the end, listed at $125 as a one-off. Then add whatever schedule of replacements the clinician sets, at $100 a set on the subscription figure AlignerCo publishes. The treatment dominates the first year and nothing else does after it: $200 a year of retainers, indefinitely.

None of that is a hidden charge — every figure in the paragraph above is on a page the seller publishes. It is simply that the marketing quotes the first number and the budget needs all of them.

One more reason to plan it: the moment people stop replacing retainers is almost never a decision. It is a retainer that cracked in a month when money was tight, and a gap that turns into a year.

How long you wear one

Long enough that "how long" is the wrong question. The plan for keeping teeth where they were moved to is set by the clinician who moved them, and it usually starts with more wear and settles into less.

What nobody can give you from a web page is your own schedule, and any site offering you a universal one — so many months full-time, then nights forever — is quoting a convention rather than your treatment plan. Ask the person who finished your case, and ask them to write it down.

Why teeth drift at all

Moving a tooth is not like moving furniture. The bone and the fibres around the root are reshaped during treatment and need time to settle into the new arrangement, and the tissues that were stretched pull the other way in the meantime. That is the reason retention exists at all, and the reason the first phase of it is usually the most demanding.

Teeth also keep changing for reasons that have nothing to do with treatment. Crowding of the lower front teeth is common in adults who never had any orthodontics at all. A retainer is holding a line against that as well, which is why clinicians talk about retention in years rather than weeks.

None of that tells you what your own schedule should be, and it is not meant to. It is context for a question worth asking properly at the final appointment: what am I wearing, how often, and for how long — in writing.

Fixed retainers are a different product

Some cases are held with a thin wire bonded behind the teeth instead of, or as well as, a removable retainer. It cannot be forgotten, which is its advantage, and it needs cleaning around and occasional checking, which is its cost.

Whether a bonded retainer suits a particular case is a clinical decision. It is worth asking about, because the failure mode of a removable retainer is a drawer.

What a retainer will not do

A retainer holds teeth where they are. It does not correct movement that has already happened. If teeth have drifted since treatment finished, an old retainer may no longer seat — and forcing one that does not fit is exactly the sort of unsupervised movement the US Food and Drug Administration warns about when it lists "worsening tooth misalignment" and "new gaps between teeth" among the effects associated with aligners used without supervision.

If your retainer stopped fitting, that is an appointment, not an experiment.

Building it into the price

When you are comparing courses, add the retainer line before you compare. A plan at one price with retainers included and a plan at a lower price with retainers charged separately are not the same offer, and only one of them tells you what the treatment actually costs.

Every published course price, with what it includes, is on what clear aligners cost, read at source. The cleaning routine for a retainer is the same one the trays needed — how to clean aligners without wrecking them covers both.