The day braces come off or the last aligner goes in the bin feels like the finish line, but the teeth do not know that yet. Left without support, they tend to drift back towards where they started, which is why every course of orthodontic treatment ends with a retainer. For most people that means a retainer worn at night for the long term.
There are three main types, and the choice usually comes down to how they fit your teeth, your habits and how easily you will remember to wear them.
Why straightened teeth try to move back
Teeth sit in bone, held by fibres that stretch and reorganise as the teeth are moved. Those tissues take months to settle around the new positions, and some of the fibres around the necks of the teeth keep pulling towards the old ones for longer. On top of that, teeth continue to shift slowly throughout adult life, braces or not, often with the lower front teeth becoming more crowded over time.
A retainer holds everything still while the tissues adapt and then guards against that slow lifelong drift. That is why retention is part of the treatment plan from the start, as we explain in our guide to straightening crooked teeth.
Clear, wire or bonded: how they differ
Clear plastic retainers
These are thin, removable trays moulded to fit snugly over the teeth, similar in look to a clear aligner. They are hard to spot and most people find them comfortable. They do wear and can crack or discolour over time, so expect to replace them every so often. Because they cover the biting surfaces, they come out for eating. They are a natural follow-on from clear aligner treatment.
Wire and acrylic (Hawley) retainers
The traditional design has an acrylic plate that sits against the roof of the mouth or behind the lower teeth, with a wire across the front. They are sturdy and can be adjusted slightly. The wire is visible, and the plate can affect speech for the first few days.
Bonded (fixed) retainers
A thin wire is glued to the back of the front teeth, out of sight. It works all day and night with nothing to remember. The trade-offs are that cleaning and flossing around it take more care, and the wire or one of its bonds can occasionally come loose and need repair. Many people have a bonded wire behind the front teeth and a removable retainer as well.
| Type | Seen when smiling? | Day-to-day effort | Common issues |
|---|---|---|---|
| Clear plastic | Barely | Wear as instructed, clean daily | Wears or cracks, needs replacing over time |
| Wire and acrylic | The front wire shows | Wear as instructed, clean daily | Bulkier, takes time to get used to |
| Bonded wire | No | Careful cleaning around the wire | A bond can loosen and need repair |
What the research says about choosing one
A 2023 Cochrane review (Martin and colleagues) pulled together 47 trials with 4,377 participants comparing retainers after braces. Its main message is that the evidence is of low to very low certainty, so no single approach can be called best. Some individual findings were still useful. In one trial, clear plastic and Hawley retainers held the lower teeth about equally well, with Hawley retainers less likely to fail but less comfortable. Another found no clear difference in stability between part-time and full-time Hawley wear. Clear plastic retainers were linked with healthier gums than bonded wires in some studies, but bonded wires held the teeth slightly more firmly, although the differences in stability were too small to matter much clinically.
In practice, the right retainer depends on how your teeth were moved, your bite, how well you clean around a wire and what you will reliably wear.
How long you will need to wear one
Your dentist will give you a schedule, and it is worth following closely. A common pattern is close to full-time wear in the early months, then moving to night-time wear once the teeth have settled. Many dentists and orthodontists now advise continuing to wear a retainer at night for the long term if you want the teeth to stay where they are. Some people can later drop to a few nights a week, but stopping altogether is a common reason teeth move back.
If you have a bonded wire, it does the work around the clock, but it still needs checking at your regular visits.
Looking after your retainer
- Brush removable retainers gently each day with cool water and a soft brush. Hot water can warp plastic, and gritty toothpaste can scratch it.
- Keep the retainer in its case whenever it is out of your mouth. Retainers wrapped in a serviette are easily thrown away.
- Clean carefully around bonded wires, using floss threaders or small interdental brushes. Our guide to flossing properly has tips.
- Have a cracked, loose or worn retainer checked promptly. If one goes missing, our article on lost or swallowed retainers explains what to do.
If your teeth have already shifted
If it has been a while since you wore your retainer and the teeth have moved, do not force the old one in, as it may no longer fit and can be painful. See a dentist. Small changes can sometimes be corrected with a short course of clear aligners, which our Invisalign cost guide covers, followed by a new retainer. Acting early usually keeps any re-treatment simpler. Lumi offers clear aligners, and complex cases may be referred to a registered orthodontist.
For more detail, read our comparison of fixed and removable retainers and our article on whether teeth shift without a retainer.
Questions we are often asked
Which retainer is best?
None is clearly best for everyone, and the research does not single one out. Clear retainers are discreet, wire and acrylic retainers are sturdy, and bonded wires need no remembering. Combining a bonded wire with a removable retainer is common.
Can I get a new retainer without redoing treatment?
If your teeth have not moved, yes. A new retainer can be made from a fresh scan. If they have shifted, some realignment may be needed first.
How do I clean a clear retainer?
Brush it gently with cool water each day, and soak it occasionally in a retainer cleaning product if your dentist recommends one. Avoid hot water and abrasive toothpaste.
Need a new retainer?
If you need a replacement retainer or your teeth have started to move, the team at Lumi Dental in Melrose Park can help. Book a consultation or see our current offers, and you will usually receive a written treatment plan, often by email, before any treatment.
