How Long Does Invisalign Take?
Invisalign treatment typically takes 5-18 months, depending on the complexity of your case. Mild crowding can be resolved in as little as 5-6 months.
Treatment Times by Complexity
Mild cases (minor crowding, small gaps): 5-8 months. Moderate cases: 8-14 months. Complex cases: 14-18 months. Your Invisalign consultation includes a 3D digital scan showing the predicted timeline and result.
What Affects Speed
Wearing aligners 20-22 hours daily is critical. Compliance directly affects treatment time. Skipping aligners or wearing them less than recommended extends treatment significantly.
A Note from Dr Sarah Metias, Principal Dentist
At Station House, the cases I complete fastest are patients who wear their aligners for a full 22 hours a day without exception. The cases that overrun are almost always compliance-related — aligners left out during meals that turn into hours. I'm direct with patients from the start: Invisalign is predictable, but it only works while it's in your mouth. For mild crowding presenting to our Barnoldswick practice, 5–9 months is a realistic expectation. Complex cases involving significant rotations or spacing take longer, and I set that expectation clearly at the first appointment.
Key Statistics
| Metric | Figure | Source |
|---|---|---|
| Average Invisalign treatment time (mild cases) | 6–9 months | Invisalign clinical data UK 2024 |
| Average treatment time (moderate cases) | 12–18 months | Invisalign provider data |
| Patients who extend beyond estimated timeline due to compliance issues | 23% | Invisalign outcome data |
| Aligner wear time required per day for on-track treatment | 22 hours | Invisalign manufacturer guidance |
| Treatment time reduction with high compliance (22+ hours/day) | up to 20% | vs average wear compliance |
Clinical Evidence & References
- Ke Y et al. (2019). "A comparison of treatment effectiveness between clear aligner and fixed appliance therapies." BMC Oral Health, 19(1), 2.
- Align Technology clinical data — Average treatment duration (invisalign.co.uk)
- Cochrane Review — Orthodontic treatment for prominent upper front teeth (doi.org/10.1002/14651858)
- NICE — Orthodontic referral guidelines
Ready to Take the Next Step?
Book your £40 Smile Consultation at Station House Dental Care