Key takeaways

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Clear aligners treat mild to moderate dental corrections, including crowding, spacing, and certain bite problems.

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Minor corrections involve limited tooth movement and generally require fewer aligner stages.

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Complex cases require detailed treatment planning to determine whether aligners can achieve the required tooth movements.

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Severe jaw discrepancies, surgical cases, and highly complex movements may require alternative orthodontic treatment.

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Clear aligner treatment uses a series of customised trays that move teeth gradually according to a personalised treatment plan.

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Treatment time depends on case complexity, tooth movements, and refinement requirements.

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Consistent wear, scheduled tray changes, oral hygiene, and treatment compliance support treatment progress.

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A professional assessment confirms whether clear aligners are suitable for the teeth, bite, and required correction.

Clear aligners are best for minor to moderate dental corrections, but they are not the best option for major corrections. Aligners can treat many alignment problems from crowding and small gaps to selected bite issues such as overbite, deep bite, crossbite, and edge-to-edge bite

The type and complexity of the correction determine whether aligner treatment is suitable and how long treatment may take. Minor corrections involve simpler tooth movements, while complex cases require more extensive treatment planning and additional aligner stages. Suitability depends on the severity of the correction and the tooth movements required.

Table of Content

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What dental corrections can clear aligners treat?

A close-up of a woman wearing clear aligners.

Clear aligners treat a range of mild to moderate dental alignment and bite problems.

Crowding

Crowding occurs when there is not enough space for teeth to align properly, causing slight overlapping or crookedness. Clear aligners gradually create the necessary space and guide teeth into better alignment.

Gaps in teeth

Gaps occur when there is excess space between two or more teeth. Clear aligners gradually move the teeth closer together to reduce spacing and create a more even smile.

Slight tooth rotations

A rotated tooth sits at an angle instead of following the natural curve of the dental arch. Clear aligners apply controlled pressure to gradually rotate suitable teeth into their planned position.

Spacing

Mild spacing refers to multiple small spaces across the dental arch rather than a single gap. Clear aligners can improve overall tooth positioning by distributing teeth more evenly.

Overbite

An overbite occurs when the upper front teeth slightly overlap the lower front teeth more than normal. In suitable cases, clear aligners can help improve the bite by gradually repositioning the teeth.

Underbite

An underbite occurs when the lower front teeth sit slightly ahead of the upper front teeth. Depending on the cause and severity, clear aligners may help improve the bite through controlled tooth movement.

Crossbite

A crossbite occurs when one or more upper teeth bite inside the lower teeth instead of outside them. Clear aligners can correct certain mild crossbites by gradually moving the affected teeth into proper alignment.

Cosmetic alignment

Minor cosmetic alignment focuses on correcting slightly crooked, tilted, or uneven teeth that affect the appearance of the smile. Treatment improves alignment while maintaining the planned bite relationship.

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When are clear aligners not suitable?

Clear aligners are not suitable for every orthodontic problem. Severe skeletal jaw discrepancies, cases requiring jaw surgery, and some highly complex tooth movements fall outside routine aligner treatment. Severe crowding, cases requiring extractions, and highly complex tooth movements may require fixed braces, surgical treatment, or a combination of orthodontic approaches. Examples include:

  • Severe skeletal discrepancies involving the position or size of the jaws

  • Cases requiring jaw surgery

  • Severe crowding requiring extractions

  • Complex tooth movements that require greater control than aligners provide

How long does clear aligner treatment take?

Caspersmile Clear Aligners generally fix mild to moderate dental concerns in 3 to 5 months. Whereas, in-office aligners might take up to 18 months, depending upon the case.

Minor corrections generally require fewer aligner stages, while complex corrections take longer because they involve more extensive tooth movement. Treatment duration also depends on the number of teeth being moved, the type of correction, and whether refinement aligners are required. The exact timeframe comes from the individual treatment plan.

Finally, yes to clear aligners for minor corrections, no for major ones

Clear aligners are suitable when your teeth and bite can be corrected safely and predictably through planned tooth movements. A professional assessment confirms whether clear aligners are appropriate for your specific dental correction.

This applies to both professionally supervised and at-home clear aligners, as treatment begins with a clinical assessment and personalised treatment plan.

Frequently asked questions

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Yes. Clear aligners treat many minor and moderate orthodontic problems, including crowding, spacing, tooth rotations, and selected bite issues. Some complex cases may require braces or combined treatment.
A professional smile assessment evaluates your teeth and bite to determine whether clear aligners are the right treatment option.
Treatment time varies by case complexity, but major corrections typically take longer than minor cases and may require additional aligners or refinements.
Yes. Wearing retainers after treatment helps maintain your new tooth position and reduces the risk of relapse.

Citations

Website, N. (2026c, July 2). Braces. nhs.uk. https://www.nhs.uk/tests-and-treatments/braces/

Clear aligners - British Orthodontic Society (BOS). (2022, September 23). British Orthodontic
Society (BOS). https://bos.org.uk/clear-aligners/