Invisalign Lite is capped at 14 aligner sets and treats mild crowding, small relapse or minor cosmetic issues — typically 4–7 months at £2,500–£3,200 in London. Invisalign Comprehensive has unlimited aligner sets and treats moderate-to-complex cases including bite correction — typically 10–18 months at £4,200–£5,500. Your case complexity, not your preference, determines which is right.
Both Invisalign packages are made by Align Technology and use the same SmartTrack material and attachments. The difference is the number of aligner sets included — and therefore the complexity of movement that can be achieved.
Invisalign Lite is a capped package: a maximum of 14 aligner sets per arch. Invisalign Comprehensive is not capped — your treatment continues until your clinician is satisfied with the result, including refinement sets at no extra cost.
According to Align Technology’s UK product information, the underlying aligner material, accuracy and predictability are identical between packages. The Comprehensive package costs more because it covers more aligners, more refinements and a longer clinical relationship.
| Package | Aligners per arch | Total aligners | Average treatment time |
|---|---|---|---|
| Invisalign Express i7 | Up to 7 | Up to 14 | 3–4 months |
| Invisalign Lite | Up to 14 | Up to 28 | 4–7 months |
| Invisalign Moderate | Up to 20 | Up to 40 | 7–10 months |
| Invisalign Comprehensive | Unlimited | Unlimited | 10–18 months (avg) |
Each aligner is worn for 7–14 days. A 14-aligner Lite case at 7-day changes finishes in 14 weeks plus refinement.
| Package | Pure Smiles price | London market range | Refinements included? |
|---|---|---|---|
| Invisalign Express i7 | £1,950 | £1,800–£2,400 | 1 round |
| Invisalign Lite | £2,800 | £2,500–£3,200 | 1 round |
| Invisalign Moderate | £3,500 | £3,200–£4,000 | 2 rounds |
| Invisalign Comprehensive | £4,500 | £4,200–£5,500 | Unlimited |
Both packages include the iTero scan, ClinCheck plan, all aligners, attachments, IPR and Vivera retainers at Pure Smiles. For the full pricing context, see how much does Invisalign cost in London 2026.
The decision is made by your clinician based on the diagnostic record — not by you choosing the cheaper option. According to British Orthodontic Society guidance, choosing an undersized treatment package for a case that needs more results in compromised outcomes and unhappy patients.
Lite is suitable when:
Comprehensive is needed when:
At Pure Smiles, your consultation includes an iTero scan and ClinCheck preview, so you see exactly which package fits your case before committing to treatment.
Around 10–15% of Lite cases at most clinics need upgrading mid-treatment, typically because more movement is needed than the original ClinCheck predicted. Two paths:
According to the British Orthodontic Society, informed consent for orthodontic treatment must include the possibility of needing additional aligners or a different package. Any clinic that quotes Lite confidently without explaining this is glossing over a real risk.
Pure Smiles applies the original Lite fee as credit toward Comprehensive — you don’t pay twice. We also offer a “ClinCheck guarantee” — if our diagnostic predicts Lite and you genuinely need Comprehensive, we cover the upgrade.
For finishing touches after alignment, see our composite bonding vs veneers guide and Invisalign attachments explained.
Book an Invisalign consultation in Fulham to find out which package fits your case.
Lite is capped at 14 aligner sets per arch (mild cases). Comprehensive has unlimited aligners and refinements (moderate-to-complex cases including bite correction).
An iTero scan and ClinCheck simulation at consultation predicts the number of aligners needed. 14 or fewer per arch = Lite. More = Comprehensive.
Yes for genuine mild cases — it saves £1,000–£2,000 and finishes faster. Choosing Lite for a case that needs Comprehensive leads to compromised results or upgrade fees.
Yes. Pure Smiles applies the Lite fee as credit toward Comprehensive — you pay the difference, not the full Comprehensive price.
At Pure Smiles, yes — Vivera retainers are included in both. Confirm this with any provider, as some clinics exclude retainers from Lite to lower the headline price.
