How long does Invisalign take?
Last updated September 3, 2026.
Mild cases take months; complex cases take 18 to 24 months, about the same as braces. The AAO describes the mechanics: each aligner is worn about a week, at least 22 hours a day, moving teeth a fraction of a millimeter at a time, so your tray count is your timeline. NHS inform says orthodontic treatment usually delivers good results within 18 to 24 months when appliances are worn as instructed. Setup adds weeks before you start: scanning, planning, manufacturing, and fitting attachments. Compliance is the swing factor, since trays out of your mouth move nothing. Retainers after treatment are not optional if you want the result to stay.
What to do
- Ask for your projected tray count; one tray per week turns it into a finish date.
- Wear trays 22 hours a day: out only for eating, drinking anything but water, and brushing.
- Change trays on schedule and keep the previous one as a backup.
- Budget time for setup: scans and manufacturing add weeks before tray one.
- Plan on a retainer afterward or the teeth drift back.
Related questions
- Why are my teeth sensitive?
- Why is my bite off after the dentist?
- Why do I get mouth ulcers so often?
- Why do I get a dry mouth at night?