Everything You Need To Know About Teeth Retainers

Reviewed and updated by the Milk Orthodontics specialist team, July 2026.

Why retainers matter as much as braces

Teeth move. Not just before treatment, but for the rest of your life. Gums, bone and muscle keep adapting as we age, and teeth naturally drift with them. After braces or aligners have moved your teeth into their new positions, retainers hold everything steady while the bone and gums settle, and then protect the result long term.

That is why we treat retention as part of orthodontic treatment, not an optional extra. At Milk Orthodontics your retainers and aftercare are included in your all-inclusive treatment fee, because a smile you have invested in deserves to last.

How retainers work

After active treatment your teeth sit in new positions, but the bone and soft tissue around them need months to fully adapt. A retainer holds the teeth exactly where they should be while that happens. Skip this stage and teeth quietly slide back toward where they started, a process called relapse. It can undo months of hard work surprisingly quickly.

The types of retainers we use

Fixed (bonded) retainers

A thin wire bonded behind the front teeth, invisible from the outside and working 24 hours a day. You cannot forget to wear it. It does need careful cleaning around the wire, and regular checks to make sure it is still firmly attached.

Clear removable retainers

Slim, transparent trays custom made from a scan of your finished smile. Nearly invisible, easy to remove for eating and cleaning, and the most popular choice with our patients. They live in a case whenever they are not in your mouth, away from heat and pets.

Hawley (plate) retainers

The classic wire and acrylic plate. Durable, adjustable and easy to clean, though more visible than a clear tray. Still a great option in the right case, especially for younger patients.

How long do you wear a retainer?

Here is the honest answer most people do not hear: some form of retention is for life. Typically you wear removable retainers full time for a short period after treatment, then nights only. Over time many patients drop to a few nights a week. Your orthodontist will give you a schedule for your case, but the principle is simple: as long as you want your teeth straight, retain them.

Looking after your retainer

Clean removable retainers daily with a soft brush and cold water. Never hot water, which can warp them. Keep them in their case whenever they are out of your mouth. Dogs find retainers irresistible, and pockets and lunch wraps are where retainers go missing. For bonded wires, careful brushing and flossing around the wire keeps everything healthy.

What do retainers cost in NZ?

If you are having treatment with us, retainers are included. Our fees are all-inclusive of records, appliances, appointments, retainers and aftercare, so there is no surprise bill when your braces come off.

If you had treatment elsewhere, or a retainer has been lost or broken, we can help with replacements even if we did not do your original treatment. See our retainers and replacements page for how it works, or call us on (09) 520 1880.

Lost or broken your retainer?

Act quickly. Teeth start drifting within days, and the sooner a replacement is made, the more likely your smile stays exactly where it should be. Get in touch, and in the meantime keep wearing any retainer that still fits without forcing it.

Wondering whether your teeth have already moved? A free Smile Assessment is the easy way to find out where things stand, and our before and after gallery shows what is possible if they have.

Keeping your retainer working for years, not months

The post above covers the essentials. Here is the longer view, because a retainer is a small appliance you will rely on for a very long time, and a little routine keeps it doing its job.

A care routine that lasts

Beyond the daily clean, it helps to give a removable retainer a gentle deeper clean from time to time to keep it clear and fresh, using a product recommended for retainers rather than harsh household cleaners or boiling water, both of which can damage the material. Let it air dry before it goes back in its case, so moisture does not sit trapped in a sealed box. Keep the case itself clean too, and replace a grubby or cracked case when it needs it. For bonded retainers, mention the wire to your dental hygienist so it is checked and cleaned around at your regular visits.

When a retainer needs replacing

Retainers do not last forever. Clear retainers in particular are thin by design and gradually wear, cloud or thin out with years of nightly use. Signs it may be time for a fresh one include cracks, a loose or vague fit, warping, or a retainer that no longer clicks firmly into place. A retainer that has become brittle or ill-fitting is not protecting your teeth as well as it should, so it is worth having it looked at rather than persevering with it. If you grind your teeth at night, retainers can wear faster, and we can talk through options that cope better with that.

If your retainer is lost, broken or left behind

It happens more often than you would think, on holidays, in hotel rooms, wrapped in a napkin at a cafe. The key is to act quickly, because teeth begin to drift within days. Keep wearing any older retainer that still fits in the meantime, even a snug one, as it may hold ground until a replacement is ready. At Milk we make retainer replacements and repairs, including for people who had their original treatment elsewhere, so you are not stranded if the worst happens. A quick call to (09) 520 1880 gets things moving, and you can see how it works on our retainers page.

Looking after retainers is a small habit with a big payoff: it protects everything your braces or aligners achieved. If you are unsure whether your teeth have already shifted, a complimentary Smile Assessment is the easy way to find out where things stand, with no referral needed.