Care after aligner treatment

Teeth can keep moving after the last aligner, and a retainer is what holds the result. The American Association of Orthodontists (AAO) says you will likely need one for life, though the hours a day can drop over time. Your orthodontist sets the schedule. Before your last appointment, find out which retainer you are getting, what a replacement costs, and who to call if it is lost or stops fitting.

Why teeth move after treatment

Teeth move throughout life. Bone is always being rebuilt, and speaking, biting and chewing push on the teeth while it happens. Without something holding them, teeth tend to drift back toward where they started. The settling period right after treatment is when they are most likely to move, which is why your orthodontist may ask for full-time wear at first and later only at night. The AAO warns that skipping a retainer for even a few days could let teeth shift significantly.

Retainer types compared

There are three common kinds. Your orthodontist will advise which suits you.

Before your last appointment

Ask, and keep the answers in writing:

• Which retainer, and how many sets, does my treatment fee include?
• What is my wear schedule now, and when will it change?
• Who do I contact if a retainer is lost, cracked or will not fit, and how fast can a replacement be made?
• What does a replacement cost, per arch or per set, and is there a replacement program?
• Are my scans kept on file so a replacement can be made without new records?
• Who repairs a fixed wire, and what does that cost?

How long you wear it

The hours depend on your orthodontist and on how long it has been since treatment ended; the wear often decreases, but the retainer is typically needed for life. Follow the schedule you are given.

Companies that sell retainers often recommend replacing them on a set calendar, such as every six months (NewSmile and AlignerCo both do); that is their recommendation, not a clinical rule for your teeth.

Replacement costs and insurance

The first set is often included in the treatment fee; replacements are usually extra. Insurance coverage varies. Many plans treat retainers as part of the original fee, so you often pay for a replacement yourself, though you may be able to use a flexible spending account (FSA) or health savings account (HSA). There is no single US price. Published examples, checked on October 22, 2026:

A mail-order replacement is made from impressions you take at home, without an orthodontist checking the fit. If your teeth have already moved, a retainer made to their new position holds them there.

What a treatment fee should include is in what clear aligners cost in the United States.

If something goes wrong

Do not go back to an old aligner tray without your orthodontist's advice. Store a removable retainer in its case whenever it is out; as the AAO puts it, if it is not in your face, it should be in the case.

Cleaning

Brush a removable retainer daily with a soft toothbrush and cool water, with mild soap if you like; soak it in a retainer-cleaning solution at least once a week; let it air-dry; and keep it away from hot water, bleach, alcohol-based products and the dishwasher. If your orthodontist gave you different instructions, follow those. A fixed wire needs careful brushing and cleaning between the teeth, as your orthodontist shows you. The daily clean for aligners is in how to clean clear aligners.

Dentist and orthodontist visits

These are different appointments. Keep your regular dental checkups for decay and gum disease. Contact your orthodontist when a retainer is lost, damaged, loose or no longer fits the way it did.