Clear Aligners: How They Work, What They Cost, and Why Supervision Matters

Clear aligners have quietly become the default way adults straighten their teeth. They are a series of transparent, removable trays, each worn for one to two weeks, each shaped fractionally differently from the last, so that over the course of treatment your teeth are guided into a planned position. No brackets, no wires, and nothing that stops you eating what you like.

The part worth understanding before you spend anything is that not all aligner treatment is the same thing. The trays may look identical. What differs is whether a dentist examined your mouth first, and whether anyone is watching what happens next.

How the treatment actually works

Treatment starts with a 3D scan of your teeth. From that scan your dentist plans the movement tooth by tooth and produces a digital simulation of the predicted end result, which you see on screen before agreeing to anything. Once you approve the plan, the aligners are manufactured as a full set.

You wear them 20 to 22 hours a day, removing them to eat, drink anything other than water, and brush. Small tooth-coloured attachments are usually bonded to a few teeth to give the aligners something to grip — these come off at the end. You change to the next aligner in the series roughly every week or two, and see your dentist periodically so progress can be checked against the plan and corrected if a tooth is not tracking.

Most cases run six to eighteen months. When the teeth are in position, you wear retainers to hold them there — permanently, at night. Teeth drift back without them, and any provider who does not make that clear is not telling you the whole story.

Dentist-supervised versus mail-order

Direct-to-consumer aligners, ordered online from an impression kit posted to your home, are cheaper for a reason: nobody examines you. That matters more than it sounds.

Before any tooth is moved, someone needs to establish that your gums are healthy, that there is no untreated decay, that the roots and bone can take the movement, and that your bite will still work at the end. Moving teeth through unhealthy gum tissue can cause lasting damage. A general dental examination and, where needed, X-rays are what rule that out — and a posted impression kit cannot do any of it.

The General Dental Council has been clear that a dentist must carry out a clinical assessment before orthodontic treatment begins, and remain responsible throughout. When treatment is supervised, a tooth that stops tracking is spotted at a review appointment and corrected. When it is not, the first anyone knows is at the end.

What clear aligners cost

Across the UK, dentist-supervised clear aligner treatment generally runs from about £1,500 to £5,500. Central London clinics sit at the top of that range; the same treatment outside Zone 1 is routinely a good deal less.

At Toothi in Edgware, treatment is £1,495, £2,495 or £2,995 — which tier applies depends on how much movement your teeth need, not on how much we think you will pay. Every figure is published on our fees page. Finance is available from around £33 a month, subject to status, and retainers are included. For a detailed comparison of what London clinics charge, see our Invisalign cost in London guide.

Are you a candidate?

Clear aligners handle crowding, spacing, mild to moderate bite problems and — very commonly — relapse in adults who had braces as teenagers and stopped wearing retainers. Some cases are better treated another way: severe skeletal discrepancies, certain rotations, and teeth needing substantial vertical movement can be more predictable with fixed appliances.

Working out which group you fall into takes a scan and an examination, which at Toothi are free. You leave with a simulation, a written plan and a fixed price, with no obligation to proceed. Book the free 3D scan here, or read more about Invisalign® clear aligners at Toothi.

Treatment at Toothi

• Published pricing — £1,495 / £2,495 / £2,995, on the fees page, before you walk in.
• Planned and delivered by Dr Ali El-Kabengi (GDC 270807), who has a special interest in clear aligner treatment.
• iTero 3D scanning — no impression trays, and you see the simulation the same appointment.
• Retainers included, because holding the result is part of the treatment, not an upsell.
• Open seven days, including Saturdays and Sundays, at 1 Handel Parade, Edgware HA8 6LD — two minutes from Edgware Station.

People also ask

How much do clear aligners cost in the UK?
Dentist-supervised treatment generally runs from about £1,500 to £5,500 depending on complexity and location. At Toothi, treatment is £1,495 to £2,995 with finance available from around £33 a month, subject to status.

Do clear aligners actually work?
Yes, for the cases they suit — crowding, spacing, mild to moderate bite issues and relapse. Results depend heavily on wearing them 20 to 22 hours a day; the most common reason treatment underperforms is inconsistent wear rather than the aligners themselves.

Are at-home aligners safe?
The concern is not the plastic but the missing examination. Without a clinical assessment, untreated decay or gum disease can go unnoticed while teeth are being moved, which risks lasting harm. A dentist should examine you before treatment and monitor it throughout.

How long do I have to wear retainers?
Indefinitely, at night. Teeth have a natural tendency to drift back towards their original position, and retainers are what prevent it. This applies after any orthodontic treatment, fixed braces included.

Can I drink coffee with clear aligners in?
Take them out for anything other than water. Hot drinks can distort the plastic and coloured drinks will stain it, and any liquid trapped against the teeth under an aligner raises the decay risk.

Toothi Dental, 1 Handel Parade, Whitchurch Lane, Edgware, London HA8 6LD · 020 3148 2444 · Mon–Wed & Fri 9am–6pm, Thu 9am–12pm, Sat 9am–5pm, Sun 10am–5pm (open 7 days). Dr Ali El-Kabengi GDC 270807; Dr Jeelna Shah GDC 211658. Free consultation and 3D scan, 0% and low-interest finance available subject to status. Invisalign® is a registered trademark of Align Technology, Inc.