Station House Dental Care Blog

How Long Does Invisalign Take?

Dr Sarah Metias BDS (University of Sheffield, UK) · MJDF RCS England · GDC 114267
Principal Dentist, Station House Dental Care · View profile →

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 monthsInvisalign clinical data UK 2024
Average treatment time (moderate cases)12–18 monthsInvisalign provider data
Patients who extend beyond estimated timeline due to compliance issues23%Invisalign outcome data
Aligner wear time required per day for on-track treatment22 hoursInvisalign manufacturer guidance
Treatment time reduction with high compliance (22+ hours/day)up to 20%vs average wear compliance

Clinical Evidence & References

SM
Clinically Reviewed by Dr Sarah Metias
BDS Sheffield, MJDF RCS England, GDC 114267
Dr Metias is the Principal Dentist at Station House Dental Care with 19 years of clinical experience. She holds the Membership of the Joint Dental Faculties from the Royal College of Surgeons — a postgraduate qualification from the Royal College of Surgeons of England. View full profile →
Published: February 2026 · Last reviewed: April 2026

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Editorial policy: All clinical content on this site is written or reviewed by a GDC-registered dentist with relevant postgraduate qualifications. We update clinical guidance when new evidence emerges. This page was last reviewed in April 2026. For personalised advice, book a consultation — online information cannot replace a clinical examination.