Clear Aligners Explained: What They Are, How They Work, and Who They Suit
The Treatment Everyone Is Talking About
Over the past decade, clear aligners have transformed the way many adults and teenagers think about straightening their teeth. The idea of achieving a straighter smile without metal brackets and wires — using a series of nearly invisible, removable trays — has made orthodontic treatment accessible and appealing to a generation of patients who would never have considered traditional braces.
At Dr Gray Dentistry in Durban, Dr Gray offers clear aligner treatment as part of a comprehensive range of orthodontic options — and the consultation process always involves an honest discussion of whether aligners are the right tool for each individual patient's case. Because while clear aligners are genuinely excellent for the right patient, they are not a universal solution — and understanding both their strengths and their limitations is essential before committing to treatment.
What Are Clear Aligners?
Clear aligners are a series of custom-made, removable orthodontic trays — each one manufactured from a smooth, transparent thermoplastic material that fits precisely over the teeth. Each tray in the series is slightly different from the one before it, designed to move specific teeth by a small, controlled amount. By progressing through the series — wearing each tray for the prescribed period before moving to the next — the teeth are gradually guided from their starting positions toward the planned final result.
The treatment is planned digitally before the first tray is ever worn. Using a precise digital scan of the teeth, Dr Gray maps out the complete movement sequence — from the current tooth positions to the planned final positions — and the full series of trays is produced based on this plan. Many patients find it motivating to see a digital preview of their expected result before treatment even begins.
How Do Clear Aligners Move Teeth?
Clear aligners move teeth using the same biological principle as traditional braces — controlled, sustained pressure applied to specific teeth causes the bone surrounding the roots to remodel, allowing the teeth to shift gradually into new positions.
The difference is in how that pressure is delivered. Rather than a wire applying continuous force through brackets, each aligner tray is manufactured to fit very slightly differently from the current tooth positions — creating gentle pressure in specific directions that nudges targeted teeth toward their planned positions. When that tray has done its work and the teeth have moved to match it, the next tray takes over — slightly different again — continuing the movement sequence.
Attachments
For more complex movements, small tooth-coloured composite attachments are bonded to specific teeth before treatment begins. These attachments give the aligner trays additional grip and leverage — allowing them to achieve rotations, extrusions, and other movements that smooth trays alone cannot reliably produce. Attachments are barely visible but are an important part of what makes modern aligner treatment capable of addressing more than just simple spacing and crowding.
Interproximal reduction
In some cases, small amounts of enamel are carefully removed from between specific teeth — a process called interproximal reduction or IPR — to create the space needed for teeth to align without extractions. This is a routine, comfortable procedure that removes only a fraction of a millimetre of enamel and has no meaningful impact on tooth health.
The Treatment Process Step by Step
Step one — consultation and assessment
Dr Gray examines the teeth, bite, and jaw, reviews X-rays, and takes a digital scan of the teeth. This assessment determines whether clear aligner treatment is suitable for the case and what the realistic outcome of treatment would be.
Step two — digital treatment planning
The digital scan is used to create a precise three-dimensional model of the teeth, and the complete movement sequence is planned — mapping every tooth movement from start to finish. The number of trays needed, any attachments required, and the expected treatment duration are all determined at this stage.
Step three — tray fabrication
The full series of aligner trays is manufactured based on the digital plan. Depending on the system used and the complexity of the case, this may involve anywhere from a small number of trays for mild corrections to a large series for more comprehensive treatment.
Step four — fitting and attachments
At the first treatment appointment, any attachments are bonded to the relevant teeth and the first aligner tray is fitted. Dr Gray checks the fit, confirms the aligner is seating correctly, and provides detailed instructions on wear time, removal, cleaning, and progression through the series.
Step five — wearing the trays
Each tray is worn for the prescribed period — typically one to two weeks — before progressing to the next. Trays are removed for eating, drinking anything other than water, and oral hygiene. The most critical requirement throughout treatment is consistent wear time — aligners must be worn for 20 to 22 hours per day to move teeth according to the planned schedule.
Step six — progress appointments
Regular check-up appointments at Dr Gray Dentistry allow Dr Gray to monitor progress, confirm that the teeth are tracking correctly with the planned movements, and address any issues that arise. These appointments are typically less frequent than traditional brace adjustment appointments — but they are no less important. Skipping them means missing the opportunity to catch and correct any tracking problems before they compound.
Step seven — refinements if needed
In some cases, additional trays — called refinements — are needed at the end of the planned series to fine-tune the result. This is particularly common in more complex cases or where tooth movements have not tracked exactly as planned. Refinements are a normal part of aligner treatment rather than a sign that something has gone wrong.
Step eight — retainers
Once the planned result is achieved, retainers are fitted to hold the teeth in their new positions. As with all orthodontic treatment, the retention phase is essential — without consistent retainer wear, teeth will drift back toward their original positions over time.
Who Is a Good Candidate for Clear Aligners?
Clear aligners produce excellent results for the right patients. The cases where aligners tend to work most effectively include:
Mild to moderate crowding
Aligners are highly effective for correcting mild to moderate crowding — teeth that are overlapping, rotated slightly, or sitting out of line. This is the most common presentation in adult patients seeking orthodontic treatment and represents the core strength of aligner therapy.
Spacing and gaps
Gaps between teeth — diastemas — respond well to aligner treatment. Closing spaces is one of the more straightforward tooth movements for aligners to achieve reliably.
Mild bite corrections
Mild overbites and some mild crossbites can be addressed with aligner treatment, particularly when attachments and precision bite ramps are incorporated into the aligner design.
Adult patients with good compliance
Adults who understand the compliance requirements of aligner treatment and are motivated to wear their trays consistently are excellent candidates. The self-discipline required for successful aligner treatment is typically more readily available in adult patients than in younger teenagers.
Patients with aesthetic priorities during treatment
Adults in professional environments, patients preparing for significant social events, and anyone for whom the appearance of metal braces during treatment is a significant concern are well suited to aligner treatment — provided their case is appropriate.
Who May Not Be Suited to Clear Aligners?
Dr Gray is direct with patients when aligners are not the optimal tool for their case. Presentations where fixed braces are likely to produce more reliable results include:
Severe crowding
Significant crowding — particularly where extractions are needed to create space — involves complex, three-dimensional tooth movements that fixed braces manage more efficiently and predictably than aligners.
Significant bite corrections
Large overbites, underbites, and open bites with a significant vertical component are more challenging for aligners to address comprehensively. In these cases, fixed braces — often combined with elastics and other auxiliaries — produce more precise and stable corrections.
Significant rotations
Severely rotated teeth — particularly round-rooted teeth like premolars — are among the more difficult movements for aligners to achieve reliably. Fixed braces apply torque and rotation forces more directly and consistently.
Patients with compliance concerns
The single most important predictor of aligner treatment success is compliance. Patients who are not confident they can commit to 20 to 22 hours of daily wear — teenagers who may be tempted to remove trays frequently, or patients whose lifestyle makes consistent wear difficult — may achieve better results with fixed braces where the appliance is always working regardless of patient behaviour.
Younger children
Clear aligners are generally not appropriate for younger children whose teeth and jaws are still in active mixed dentition — the phase where baby teeth are being replaced by permanent teeth. Phase one interceptive treatment in children is better managed with fixed appliances and specialised growth modification devices.
The Compliance Reality — What we have to Understand
No discussion of clear aligners is complete without an honest conversation about compliance — because it is the factor that most consistently determines whether aligner treatment succeeds or fails.
Twenty to 22 hours of daily wear means that aligners are out of the mouth for a maximum of two to four hours per day — for eating, drinking anything other than water, and oral hygiene. That is less time than many patients initially appreciate.
What it means in practice:
Aligners go back in immediately after eating and brushing — not later, not after a coffee, immediately
Snacking between meals becomes a significant inconvenience — because every snack requires removing the aligners, eating, brushing, and replacing them. Many patients find that aligner treatment inadvertently reduces snacking for this reason
Social occasions where aligners are removed for extended periods — a long dinner, a special event — need to be balanced against wear time on other days
Patients who travel frequently, have unpredictable schedules, or struggle with routine need to think honestly about whether consistent wear is realistic for them
Treatment that is not worn consistently does not produce the planned result. Teeth do not move according to the digital plan — they fall behind, trays stop fitting correctly, and refinements become necessary. Patients who are honest with themselves about compliance before starting treatment make better decisions about whether aligners or braces are the right choice for them.
Clear Aligners at Dr Gray Dentistry, Durban
Dr Gray at Dr Gray Dentistry in Durban, South Africa offers clear aligner treatment as part of a full range of orthodontic options — always within the context of a thorough assessment that determines whether aligners are genuinely the best tool for each patient's case.
The goal is never to sell a particular treatment — it is to recommend the treatment that will produce the best result for your specific teeth, bite, and lifestyle. For many patients, that is clear aligners. For others, it is fixed braces. And for some, it is a combination of both.
Book your orthodontic consultation at Dr Gray Dentistry in Durban today — and find out whether clear aligners are right for you.