Teeth Shifting After Braces? What The Research Says About Orthodontic Relapse And Retainers

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Teeth Shifting After Braces? What The Research Says About Orthodontic Relapse And Retainers

Written By Dr. Pratik Sharma, Specialist Orthodontist

Plenty of adults notice it in a photo first. A front tooth that used to sit straight now overlaps its neighbor, or a small gap has opened up again. They had braces as teenagers and assumed the result was permanent.

It rarely is. Search for “teeth shifting after braces” and you will find dozens of pages explaining that relapse is common and that retainers matter. Very few say how common, or what studies of retainer wear have actually found. This article brings that evidence together, because the numbers change how you should think about your own teeth.

What orthodontic relapse is

Relapse is the tendency of teeth to move back toward where they were before treatment. When braces or aligners move a tooth, the ligament fibers that anchor it in the jaw are stretched and the surrounding bone remodels. The bone settles within months. Some of the gum fibers, especially around teeth that were rotated, keep pulling for much longer. On top of that, teeth continue to drift slowly through adult life, whether or not someone has had orthodontic treatment.

The lower front teeth are affected most. They are what most long-term studies measure, and they are usually where people first see crowding return.

How often alignment holds once retention stops

The best-known long-term data comes from the University of Washington, where researchers followed orthodontic patients for decades after their retainers were discontinued. A Cochrane review summarizing this work reports that only 30% to 50% of patients keep satisfactory alignment of the lower front teeth 10 years after treatment, falling to around 10% at 20 years.

Context matters here. Most of those patients were treated when retainers were worn for a year or two and then put away. The figures describe what happens when retention stops, not what happens when it continues, and they are a large part of the reason most orthodontists now recommend wearing a retainer indefinitely, usually at night.

How many people keep wearing their retainers

Recommending long-term wear is easy. Doing it is harder.

A Case Western Reserve University study surveyed 428 patients during the first two years after their braces came off. Within three months, 4% had already stopped wearing their retainers. By the two-year mark, nearly 20% had stopped entirely. Between 19 and 24 months, 45% were still wearing them every night and 81% wore them at least one night a week. Age, sex and retainer type made no difference to how well people complied.

A later study of 295 patients up to four years after treatment found overall compliance of about 63%. Losing a retainer and attending fewer recall visits were among the factors linked to poorer wear.

Research from the University of Kentucky added a detail many former patients will recognize. People were more likely to wear clear vacuum-formed retainers than older wire-and-acrylic Hawley retainers during the first two years, but compliance with the clear type fell away faster after that.

Bonded retainers need checking too

Many patients are given a thin wire bonded behind the lower front teeth precisely because it removes the need to remember anything. It helps, but the wire fails more often than most people realize.

A 2023 systematic review in the European Journal of Orthodontics pooled 31 studies and found an overall failure rate for bonded retainers of about 28%, where failure means the wire breaking or coming loose from one or more teeth. Almost a quarter failed within the first year, and the risk climbed to nearly half by six years of follow-up.

The problem is that a partly detached wire often goes unnoticed. In one study of braided-wire retainers, patients whose retainer failed were about 10 times more likely to experience relapse than those whose retainer stayed intact. A wire that has come loose from a single tooth can also let that tooth move while the others are held in place.

What the evidence suggests you do

A 2023 systematic review comparing retention methods concluded that both fixed and removable retainers preserve results. Fixed retainers performed best for long-term stability of the lower front teeth, while removable retainers had higher failure rates but still offered real protection. Full-time wear of removable retainers outperformed night-only wear in the early phase.

If you still have a removable retainer and it fits comfortably, wearing it most nights is the simplest protection available to you. If it feels tight, some movement has probably already happened. Do not force a retainer that no longer seats properly, because pressing it into place puts uncontrolled pressure on the teeth. Book an assessment instead.

If you have a bonded wire, ask for it to be checked at every dental visit, and mention any roughness or movement you can feel with your tongue. A loose bond can usually be repaired quickly if it is caught before teeth shift.

If you lost your retainer years ago, a dentist or orthodontist can take a digital scan and make a replacement. Where teeth have already moved, the change can often be corrected with a short course of clear aligners rather than a full course of braces, depending on how far the teeth have moved and whether the bite has changed. Many of the adults who come to us at The London Smile Clinic for aligner treatment had braces as teenagers and stopped wearing their retainer somewhere along the way. Wherever you are treated, the first step is the same: an examination to measure the movement before choosing how to correct it.

The takeaway

Braces move teeth into position. Retainers are what keep them there. The long-term data shows alignment fades for most people once retention stops, and real-world retainer wear drops steadily after the first year. None of that means the original treatment failed. It means retention is part of the treatment, for as long as you want the result to last.

About the author

Dr Pratik Sharma is a specialist orthodontist at The London Smile Clinic in central London. His qualifications include BDS (Hons), MFDS RCS(Ed), MSc, MOrth RCS(Ed), FDS Orth RCS(Ed), FCGDent and FHEA, and he is registered with the UK General Dental Council (GDC 76562).

References

1. Interventions for managing relapse of the lower front teeth after orthodontic treatment. Cochrane Database of Systematic Reviews. cochranelibrary.com
2. Little RM, Riedel RA, Artun J. An evaluation of changes in mandibular anterior alignment from 10 to 20 years postretention. Am J Orthod Dentofacial Orthop. 1988;93:423-428.
3. Kacer KA, Valiathan M, Narendran S, Hans MG. Retainer wear and compliance in the first 2 years after active orthodontic treatment. Am J Orthod Dentofacial Orthop. 2010;138(5):592-598.
4. Jeamkatanyoo L, Suntornlohanakul S, Tianviwat S. Factors influencing orthodontic patient compliance with removable retainers. Thai Journal of Orthodontics
5. Pratt MC, Kluemper GT, Lindstrom AF. Patient compliance with orthodontic retainers in the postretention phase. Am J Orthod Dentofacial Orthop. 2011;140(2):196-201.
6. Aye ST, Liu S, Byrne E, El-Angbawi A. The prevalence of the failure of fixed orthodontic bonded retainers: a systematic review and meta-analysis. Eur J Orthod. 2023;45(6):645-661. PMC10687514
7. Gingival health and predictors of relapse with braided-wire bonded retainers. Australasian Orthodontic Journal. 2023. reference-global.com
8. Inchingolo F, Inchingolo AM, Ceci S, et al. Orthodontic relapse after fixed or removable retention devices: a systematic review. Applied Sciences. 2023. doaj.org