Invisalign vs Fixed Braces UK 2026: Cost, Time & Results Compared

Invisalign or fixed braces — which is the right orthodontic treatment for you? Both options can straighten teeth effectively, but they differ significantly on cost, treatment time, visibility, and what they can treat. This guide compares the two head-to-head using current UK pricing and clinical evidence so you can make an informed decision.

Quick comparison

| | Invisalign | Fixed Braces | |---|---|---| | Typical cost | £1,800–£5,500 | £1,500–£5,500 | | Treatment time | 6–18 months | 12–24 months | | Visibility | Nearly invisible | Metal brackets visible; ceramic less so | | Pain level | Mild pressure each new tray | Moderate soreness after adjustments | | Maintenance | Remove to eat and brush normally | Harder to clean; dietary restrictions apply | | Best for | Mild to moderate crowding, spacing, adults wanting discretion | Complex bite issues, severe crowding, rotations | | NHS availability | Almost never | Available for under-18s who qualify (IOTN 4–5) |

Pricing comparison by case complexity

Costs vary depending on the severity of your case. These are typical private UK prices for 2026:

| Case complexity | Invisalign | Fixed metal braces | Fixed ceramic braces | |---|---|---|---| | Mild (e.g. 7 aligners / 6 months) | £1,800–£2,500 | £1,500–£2,500 | £2,000–£3,000 | | Moderate (e.g. 14 aligners / 12 months) | £2,500–£3,500 | £2,000–£3,000 | £2,500–£4,000 | | Complex (unlimited aligners / 24+ months) | £3,500–£5,500 | £2,500–£3,500 | £3,500–£5,500 |

Fixed metal braces are generally the cheapest option, particularly for complex cases. Invisalign and ceramic braces are priced similarly at the higher end. Most practices offer 0% finance over 12–24 months, bringing monthly payments to roughly £80–£150 depending on total cost.

When to choose Invisalign

• Appearance matters to you. Clear aligners are nearly invisible. If you work in a client-facing role or simply prefer discretion, Invisalign is the obvious choice.
• Your case is mild to moderate. Invisalign handles crowding, spacing, and minor bite issues effectively. For straightforward cases, treatment time is often shorter than fixed braces.
• You want to eat and drink without restrictions. Aligners are removed for meals, so there are no banned foods — no avoiding toffee, popcorn, or crusty bread.
• You value easier oral hygiene. You brush and floss normally because the aligners come out. Fixed braces make cleaning significantly harder and increase the risk of decalcification (white spots) if hygiene slips.
• You can commit to wearing them 20–22 hours per day. Invisalign only works if you wear the trays consistently. Poor compliance is the single biggest reason for treatment delays or suboptimal results.

When to choose fixed braces

• Your case is complex. Severe crowding, significant bite correction (overbite, underbite, crossbite), and large tooth rotations are still handled more predictably by fixed braces. Brackets and wires give the orthodontist precise three-dimensional control that aligners cannot always match.
• You want the lowest cost. Fixed metal braces are the most affordable orthodontic option, especially for moderate to complex cases. If budget is the primary concern, metal braces offer excellent value.
• Compliance is a concern. Fixed braces work 24 hours a day with no patient discipline required. If you are treating a teenager — or you know you are likely to forget to re-insert aligners — fixed braces remove the compliance variable entirely.
• You want NHS-funded treatment. If your child qualifies for NHS orthodontics, the treatment provided will almost always be fixed braces, not Invisalign.
• You need maximum tooth movement. For cases requiring extraction of premolars and significant space closure, fixed braces remain the gold standard.

Can the NHS fund orthodontics?

NHS orthodontic treatment is available only for patients under 18 whose teeth meet the clinical threshold on the Index of Orthodontic Treatment Need (IOTN). The assessment works as follows:

• IOTN grade 1–2: No NHS funding. Treatment is cosmetic and must be funded privately.
• IOTN grade 3: Borderline. NHS funding is sometimes approved but not guaranteed — this depends on local commissioning decisions.
• IOTN grade 4–5: Eligible for NHS orthodontics. These grades indicate a definite or very great need for treatment on clinical grounds.

If your child qualifies, they will pay the NHS Band 3 charge of £319.10 for the entire course of treatment, regardless of how long it takes. This covers all appointments, the braces themselves, and retainers. The treatment will typically be fixed metal braces — NHS orthodontics does not usually cover Invisalign.

Adults are not eligible for NHS orthodontics except in exceptional clinical circumstances, such as cases requiring jaw surgery. In practice, virtually all adult orthodontic treatment in the UK is funded privately.

The verdict

There is no universally better option — the right choice depends on your case, your budget, and your priorities.

Choose Invisalign if your case is mild to moderate, you want a discreet treatment, and you can commit to wearing the trays consistently. You will pay a similar amount to ceramic braces but with far greater convenience.

Choose fixed braces if your case is complex, you want the lowest possible cost, or compliance could be an issue. Fixed metal braces remain the most versatile and affordable orthodontic treatment available.

For many patients with mild to moderate crowding, either option will deliver excellent results. Book consultations with two or three practices to compare treatment plans and pricing — most offer free or low-cost initial assessments.

Related guides

• How Much Does Invisalign Cost? — full pricing breakdown by tier and region
• Dental treatments compared — browse all dental prices
• Finance options — 0% finance and payment plans for private treatment
• Current deals — discounts and offers from UK dental practices