Orthodontic Duration: Typical Treatment Length, What Extends It, Jaw Surgery and the Retention Period

Orthodontics is divided into the period in which the appliance is attached to move the teeth, and the retention period after the appliance is removed, in which the moved position is held. Seoul National University Hospital's medical information says the treatment period differs from person to person and usually takes 1-3 years, with visits generally every 4 weeks for appliance adjustment. It gets longer if jaw correction surgery is needed or an extraction space must be closed, and it also stretches if wearing time and appointments are not kept.

Published 2026-11-08 · Updated 2026-11-08 · DentalStatics editorial team

Key facts

Typical orthodontic duration	Usually 1-3 years (individual differences) (source: Seoul National University Hospital medical information)
Interval between adjustment visits	Generally every 4 weeks (source: Seoul National University Hospital medical information)
Orthodontics before jaw correction surgery	Usually 6 months to 1 year or more (sometimes ends in 2-4 months) (source: Korea Disease Control and Prevention Agency (KDCA, 질병관리청) National Health Information Portal)
Orthodontics after jaw correction surgery	Starts 4-6 weeks after surgery, roughly 6 months to 1 year (source: KDCA National Health Information Portal)
Removable retainer	Wear as many hours as possible for at least 1 year after orthodontics (source: Korean Association of Orthodontists (KAO, 대한치과교정학회))

How long does orthodontics usually take?

Seoul National University Hospital's medical information says the orthodontic period differs by individual case, with about 1-3 years being usual. While the appliance is attached, you go to the dental clinic generally every 4 weeks to change the wire or adjust the force.

Partial orthodontics, which aligns only a few front teeth, tends to be shorter than full orthodontics, and full orthodontics, in which teeth must be moved a lot or the upper and lower bite must be changed, takes longer. The period you hear at the first diagnosis is an estimate and is adjusted by watching the speed at which the teeth actually move.

For children, an observation period falls between phase 1 orthodontics during the growth period and phase 2 orthodontics after the permanent dentition is complete, so the whole process can span several years.

What factors lengthen orthodontic treatment?

The more severe the malocclusion and the more an extraction space must be closed, the longer it takes. The Korean Association of Orthodontists explains that adults' teeth generally move somewhat more slowly than adolescents', and that where the jawbone is weak, teeth must be moved slowly with light force.

Factors on the patient's side are also large. With clear aligners, the teeth do not move as planned if the wearing time is short, and with fixed appliances, if brackets come off often the teeth move in unwanted directions in the meantime. Postponing appointments also lengthens the period.

Degree of malocclusion and whether an extraction space must be closed
Age and jawbone condition
Insufficient wearing time of clear aligners
Appliance detachment and delayed adjustment appointments
Treatment of cavities and gum inflammation that arise during orthodontics

What happens to the duration if jaw correction surgery is done together?

If surgery is needed because of an abnormality in the size or position of the upper and lower jawbones, then by the KDCA's criteria orthodontics is usually done for 6 months to 1 year or more before surgery to prepare so that the teeth meet properly at surgery. Depending on the arrangement of the teeth, there are cases in which this preparatory orthodontics is shortened to 2-4 months.

Orthodontics after surgery usually starts 4-6 weeks after surgery and takes roughly 6 months to 1 year. At this stage elastic bands are sometimes used so the teeth meet better, and if the bands are not hooked as instructed, the finishing stage gets longer.

While the jaw is fixed, a liquid diet is needed, so the surgery date is decided together with school or work schedules. The overall schedule is calculated by adding up the orthodontics before and after surgery and the recovery period.

Does a period remain even after the appliance is removed?

It does. Teeth moved to a new position need time for the surrounding tissue to settle again, so a retainer is used. The Korean Association of Orthodontists recommends wearing a removable retainer as many hours as possible for at least 1 year after orthodontics and then reducing the time as instructed by the orthodontist.

A fixed retainer bonded to the inside of the front teeth is recommended to be kept for a long time if there is no problem with the surrounding oral care, and the time of removal is decided by the orthodontist. If the retention period is not kept, the teeth may return and additional treatment may be needed.

What should I do to finish within the expected period?

The surest way is to get adjustments on the set days and keep the appliance from coming off. Avoid hard or sticky foods, and if a bracket or wire comes off, contact the clinic without waiting for the next appointment.

With clear aligners, keep them in all the time except for meals and brushing, and keep to the replacement date for each stage. It is also important to clean around the appliance carefully to prevent cavities and gum inflammation, because if cavity treatment becomes necessary during orthodontics, part of the appliance may have to be removed and the schedule can slip.

If it seems the period will run longer than expected, ask the clinic directly about the remaining stages and the reasons. If progress is explained by comparing photos or models, the remaining schedule is easier to understand.

Common myths and facts

Myth: Orthodontics is finished once the appliance is removed.

The Korean Association of Orthodontists recommends wearing a removable retainer as many hours as possible for at least 1 year after orthodontics. Orthodontics includes the retention period.

Myth: Clear aligners are always shorter.

The duration depends on the degree of malocclusion and the wearing time. If the wearing time is insufficient, treatment does not proceed smoothly.

Frequently asked questions

How long does partial orthodontics take?

It depends on the number of teeth to be moved and the distance, but it tends to be shorter than full orthodontics. First confirm by diagnosis whether it is a range that does not change the whole bite, and have the expected period explained stage by stage. A retainer is needed after partial orthodontics too.

Is there a way to finish orthodontics quickly?

Teeth must move slowly within the jawbone so that the surrounding tissue adapts with them. Rather than forcing speed, keeping to the wearing time and adjustment schedule and reducing appliance detachment is the realistic way to keep to the expected period.

Can I change clinics in the middle of orthodontics because of a move or study abroad?

You can, but because the appliance type and treatment plan differ, you may need a new diagnosis at the new clinic. Obtaining the diagnostic records and progress records helps in continuing treatment, and also check in advance how the cost is settled. If the gap during the move gets long, the overall period may extend.

Does orthodontics take much longer for adults?

The Korean Association of Orthodontists explains that adults' teeth generally move somewhat more slowly than adolescents'. However, the duration depends more on the degree of malocclusion and the gum condition than on age. If gum treatment is needed first, that time is added before orthodontics begins.

Do I have to wear a retainer for life?

For a removable retainer, wear it as many hours as possible for at least 1 year and then reduce the time as instructed. A fixed retainer is recommended to be kept for a long time if there is no problem with care, and the orthodontist decides how long to use it. Even after reducing wearing time, tooth position is checked at regular check-ups.

References

Korean version →