Invisalign and other clear-aligner systems straighten teeth using a series of custom-made, near-invisible plastic trays that apply gentle pressure to move teeth into position over time. Each tray is worn for one to two weeks before you switch to the next in the sequence. Because they're removable for eating and cleaning, many of our patients find them far less disruptive to daily life than fixed braces — though they work best for mild to moderate crowding, spacing and bite problems in patients with healthy teeth and gums.
How clear aligners work
Treatment begins with a clinical assessment and a digital scan or impression of your teeth. From that, your clinician maps out the movements needed and builds a staged plan. Software simulations can give you a reasonable preview of the likely end result before you start — a useful guide, though the actual outcome always depends on biology and how consistently you wear the trays.
You then receive a numbered series of aligners. Each tray is shaped slightly differently from the last, so when worn it applies light, continuous force that nudges specific teeth a fraction of a millimetre at a time. For some movements, small tooth-coloured "attachments" are bonded to certain teeth to give the aligner better grip. The trays only work while they're in your mouth — they typically need to be worn around 20 to 22 hours a day, coming out only to eat, drink anything other than water, and brush.
Who is a good candidate?
Clear aligners suit many teens and adults with common orthodontic concerns. According to the American Dental Association, removable aligners are one of several recognised orthodontic options alongside fixed braces, with the right choice depending on the case and the clinician's recommendation. Aligners tend to work well for:
- Mild to moderate crowding
- Gaps and spacing between teeth
- Mild to moderate overbite, underbite or crossbite
- Relapse after previous orthodontic treatment, where teeth have drifted back
They're less predictable for complex skeletal bite problems, severely rotated or tipped teeth, large gaps that need closing, or cases where teeth must travel long distances. Those situations may call for fixed braces, sometimes combined with other treatment. Aligners also depend heavily on patient discipline: because you can take them out, results suffer if you don't wear them for the recommended hours. Untreated gum disease or active decay should be stabilised first, and your suitability can only be confirmed by an in-person clinical assessment.
Invisalign vs traditional braces
Both move teeth by applying sustained pressure; the practical differences shape which one fits your life and your case.
| Factor | Clear aligners | Fixed braces |
|---|---|---|
| Visibility | Near-invisible | Visible brackets/wires (clear options exist) |
| Removable | Yes — for eating and cleaning | No — fixed in place |
| Diet | No food restrictions when removed | Avoid hard/sticky foods |
| Cleaning | Normal brushing and flossing | More effort around brackets |
| Best for | Mild to moderate cases | Mild through to complex cases |
| Relies on compliance | High — must be worn 20–22 hrs/day | Lower — always working |
A lot of our patients choose aligners for discretion and day-to-day convenience. Fixed braces remain the more versatile option for difficult movements. There's no single "best" method — only the one that suits your teeth and goals.
How long does treatment take?
Timelines vary with the complexity of the case and how diligently the trays are worn. The NHS notes that orthodontic treatment overall typically ranges from about 6 to 30 months, with retainers worn afterwards to hold the result. Straightforward aligner cases may finish in a matter of months; more involved ones can take a year or more. Inconsistent wear is, by far, the most common reason treatment runs longer than planned.
Comfort and what to expect
Aligners are generally well tolerated. That said, a new tray can feel tight and cause mild soreness for a day or two as the teeth begin to move — actually a normal sign the aligner is doing its job. It usually settles quickly. There are no wires or brackets to irritate the cheeks, though attachments and tray edges take a little getting used to. You may also notice a temporary lisp in the first few days. Removing trays because of minor discomfort slows progress, so wear them as prescribed and speak to your clinician if anything feels sharp or persistent.
Caring for your aligners
Good hygiene protects both the trays and your teeth. Rinse aligners whenever you take them out, and brush them gently with a soft toothbrush to prevent plaque and dried saliva building up. Always brush and floss before putting trays back in, so food and bacteria aren't trapped against the teeth. Because orthodontic appliances make plaque harder to clear, the NHS stresses that careful daily cleaning is essential during any teeth-straightening treatment to reduce the risk of decay and gum problems.
Retainers: keeping your new smile
Teeth have a natural tendency to drift back toward their old positions after treatment. To prevent this, a retainer is worn once the aligners are finished — often nightly for an extended period, sometimes indefinitely. Wearing your retainer as advised is the single most important step in keeping the result long term. We see this overlooked too often; please don't let it be an afterthought.
Considering treatment in Istanbul
At Bergedent Istanbul, clear-aligner planning starts with a digital scan and a tailored treatment plan. Aligner therapy is one part of a broader smile-care menu — if your concern is the appearance of already-aligned teeth rather than their position, options such as porcelain veneers, a Hollywood smile or teeth whitening may be more appropriate, and these can be discussed alongside orthodontics. If you're weighing up treatment abroad, the NHS suggests using a treatment abroad checklist to plan follow-up care and aftercare before you travel — worth keeping in mind for aligner cases, which need ongoing reviews and a retainer plan. You can review indicative costs on our price list.
Not sure whether clear aligners are right for you? Share your photos or X-rays and our clinical team will give you an honest assessment. Request a free consultation to get started.
This article is for general information and is not a substitute for personalised dental advice. Please read our medical disclaimer.