How Invisalign works
Scan, plan, wear, refine — every step explained
From the first iTero scan to the final retainer, here's exactly how Invisalign moves your teeth — and what's expected of you along the way.
The full process, start to finish
Invisalign is more than a set of clear trays — it's a coordinated treatment plan that uses 3D scanning, computer modeling, and a series of custom aligners to move your teeth from where they are to where you want them. Here's what actually happens, in the order it happens.
Step 1 — Consultation
A focused exam to confirm Invisalign is the right choice for what you want to change. We assess your overall dental health (cavities, gum disease, and untreated periodontal issues need to be handled before orthodontic movement), look at your bite, take photos, and talk through what you'd like to address. If anything would benefit from being treated first — a cavity, a failing filling — we sequence that before aligner treatment.
Step 2 — iTero 3D scan
Instead of the goopy putty impressions of decades past, a handheld iTero scanner builds a precise 3D model of your teeth in a few minutes. The scan goes directly to Invisalign's planning software. As a side benefit, the iTero outcome simulator can show you a rough preview of where your teeth will end up by the end of treatment — useful for deciding whether to proceed. See the iTero scanning page for the full breakdown.
Step 3 — Treatment plan and ClinCheck preview
We design the movements — which teeth move when, where attachments go, where IPR (small enamel reshaping) is needed — using Invisalign's ClinCheck software. Then we sit down with you and walk through the proposed plan on screen, animated frame by frame. You see exactly where your teeth start, the path they'll take, and where they'll end up. If you want to adjust the target (a slightly different final shape, a focus on one specific tooth), we tweak the plan before any aligners are ordered.
Step 4 — Aligners arrive
About three weeks after the scan, your aligners are 3D-printed and shipped to the office. At a placement visit, we bond the attachments to specific teeth (the tooth-colored bumps that give aligners something to grip for complex movements), make any planned IPR, and hand you the first set of aligners.
Step 5 — The 22-hour rule
You wear each aligner 22 hours a day. Off only for eating and brushing. Each aligner is worn for one to two weeks before swapping to the next. This is the part where Invisalign succeeds or fails — patients who wear them consistently get the results in the planned timeline. Patients who don't, end up needing refinements or longer treatment.
- Drink water with them in. Other drinks (especially anything with sugar or color) should be enjoyed with the aligners out.
- Brush before reinserting. Food trapped under the aligner against the tooth surface is a fast way to start a cavity.
- Clean the aligners daily. A soft toothbrush, lukewarm water, and a small amount of unscented soap. Hot water warps them.
- Keep the previous aligner. If you lose or break the current one, the previous keeps you on track until we can get a replacement.
Step 6 — Check-ins every 6 to 10 weeks
Brief visits (15 to 20 minutes) to confirm teeth are tracking with the plan, hand over the next batch of aligners, and make any small adjustments. We sometimes add an attachment, trim one off, or do a small amount of IPR. Most patients have 4 to 8 check-ins over the course of treatment.
Step 7 — Refinements if needed
After the initial series is finished, roughly one in three patients needs refinements — a fresh scan and additional aligners to address teeth that didn't move quite as planned. Refinements are included in the original Invisalign treatment fee. They usually add 2 to 4 months to the total timeline.
Step 8 — Retainers, for life
Once treatment is complete, the attachments come off, the teeth get polished, and you receive a set of retainers. For the first year, wear them every night while you sleep. After that, two to three nights a week long-term keeps the teeth from drifting back. Skipping retainers is the leading reason patients end up in a second round of Invisalign years later.
Common questions
Frequently asked
- How does Invisalign actually move teeth?
- Each aligner is shaped slightly differently than your current tooth position — about 0.25 millimeters of planned movement per aligner. The plastic applies gentle, sustained pressure that the periodontal ligament around each tooth root responds to over a week or two. Over a full series of aligners (anywhere from 10 to 50+), the cumulative movement straightens the smile.
- How long do I wear each aligner?
- Typically one to two weeks per aligner — your treatment plan specifies the exact schedule. You wear each aligner 22 hours a day, taking it out only to eat and to brush.
- What's the role of the attachments?
- Attachments are small tooth-colored composite bumps bonded to specific teeth. They give the aligners something to grip when a tooth needs a more complex movement (rotation, root tipping). Most adult cases use 6 to 15 attachments. They come off at the end of treatment.
- What happens at check-in visits?
- Every 6 to 10 weeks, you come in for a brief check-in. We confirm the teeth are tracking with the plan, hand over the next several aligners, and make any small adjustments — adding or trimming attachments, IPR if needed. Most check-ins are 15 to 20 minutes.
- What is IPR?
- Interproximal reduction — a small amount of enamel reshaping between specific teeth to create room for movement. We're talking 0.1 to 0.5 millimeters at most, done with a thin sanding strip. Painless, no anesthetic needed, and only used when the plan calls for it.
- What if a tooth isn't tracking?
- It happens. About one in three Invisalign cases needs refinements — a fresh scan and additional aligners after the initial series finishes, to address teeth that didn't move as planned. Refinements are included in the original treatment fee.
- Do I need a retainer after?
- Yes — for life, in some form. Teeth want to drift back to their original position; a retainer prevents that. Most patients wear a clear retainer (similar to an aligner) every night for the first year, then a few nights a week long-term. We discuss your specific retainer schedule at the end of treatment.
- How long is the whole process?
- Most adult cases run 9 to 18 months. Simple cases (minor front-tooth alignment) can finish in 4 to 6 months. Complex cases (significant crowding, bite correction) can take 18 to 24 months. We give you a specific timeline at the planning visit.
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