Orthodontic Re-Treatment UK — What to Do If Your Teeth Have Moved Back

What causes orthodontic relapse?

Orthodontic relapse — the movement of teeth back towards their pre-treatment position — is one of the most common reasons patients return to seek further treatment. The most frequent cause is failure to wear retainers as prescribed. After active treatment, the bone and soft tissue around the moved teeth remodel gradually; without a retainer holding teeth in position during this period, they drift. Other causes include wisdom teeth erupting in the lower arch and crowding the front teeth, natural age-related changes in tooth position that affect everyone — treated or not, changes in jaw growth in younger patients, and underlying functional habits such as tongue thrust that were not identified and addressed during the original treatment.

Assessing whether re-treatment is appropriate

Before re-treatment begins, a thorough assessment is essential — and it should be more detailed than the assessment before the original treatment. An orthodontist will take new clinical photographs, a full periodontal assessment (gum and bone health must be adequate before teeth can be moved again), updated radiographs, and often new study models or a digital scan. The assessment must identify why relapse occurred: if the cause was simply retainer non-compliance, better retention this time can prevent further relapse. If the cause was an unaddressed functional issue, wisdom tooth eruption, or skeletal growth, these must be factored into the re-treatment plan.

How re-treatment compares to original treatment (speed, cost, options)

Re-treatment is often faster than the original treatment because the teeth are usually returning to a position they have already occupied — the bone has a memory of the previous tooth position called the periodontal ligament memory, and teeth tend to move more readily. Many re-treatment cases are completed in 6 to 18 months rather than the 18 to 36 months typical of comprehensive original treatment. However, this is not universal: where significant relapse has occurred, where the bite has also changed, or where the original treatment did not fully correct the bite, re-treatment can be as involved as the first time. Costs are similar to or slightly lower than original treatment for most cases.

Re-treatment options — braces vs clear aligners

Most patients undergoing re-treatment have more treatment options than they did originally, as re-treatment cases are often moderate in complexity. Fixed metal or ceramic braces remain the most versatile option for all levels of relapse severity. Clear aligners — such as Invisalign or ClearCorrect — are well-suited to mild to moderate relapse, particularly crowding of the front teeth, and are popular with adults who went through braces in childhood and want a less visible option. Lingual braces (bonded to the back of the teeth) are another discreet fixed option. Your orthodontist will advise which options are clinically suitable based on the nature and extent of the relapse.

The critical role of improved retention in preventing third-time relapse

The single most important factor in preventing relapse after re-treatment is a robust, long-term retention plan that the patient will actually comply with. Bonded (fixed) retainers — thin wires glued to the backs of the upper and lower front teeth — provide continuous retention without reliance on patient compliance and are now routinely placed after re-treatment. Removable Essix or Hawley retainers are prescribed for night-time wear as a supplement. The evidence strongly supports indefinite retainer wear: teeth can continue to shift throughout life even without orthodontic treatment, so retainers should be viewed as permanent. Patients who experienced relapse due to retainer non-compliance should be counselled carefully about this before re-treatment.

Costs and NHS access for re-treatment

NHS orthodontic treatment for adults is very limited and is not generally available for re-treatment cases resulting from relapse. Adults seeking re-treatment should expect to self-fund privately. Private re-treatment costs in the UK typically range from £1,800 to £4,500 depending on complexity, treatment type, and region. Clear aligner re-treatment may cost £2,000 to £3,500 for moderate cases. For under-18s, NHS orthodontic treatment is available where the IOTN score meets the threshold; however, a second course of NHS treatment may be declined or queried if the relapse was due to retainer non-compliance, so this varies by NHS commissioner and clinical judgement.

Useful related pages

This guide is for general information only. It is not a diagnosis, treatment plan, or substitute for advice from a registered dentist or orthodontist.