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How Invisalign works and what results to expect

Dr Vladimir Kljajo
11 February 2025
3 min read

If you want a straighter smile without brackets and wires, Invisalign uses a series of clear, removable aligners to move teeth precisely and comfortably.

Here’s a clear, step‑by‑step guide to how Invisalign works—and the results you can realistically expect at Dental Istria in Poreč.

What Invisalign can treat

  • Crowding and spacing (gaps)
  • Mild to moderate overbite, underbite, and crossbite
  • Relapse after braces (post‑orthodontic shifting)
  • Mild open bite
    Note: Complex skeletal bite issues may require alternative orthodontics. We’ll advise the most efficient path during your consult.

How Invisalign works: step-by-step

  1. Digital assessment (no gooey impressions)
    We scan your teeth in 3D, take photos, and assess bite function. This lets us evaluate suitability and define goals (cosmetic, functional, or both).
  2. Custom treatment plan and timeline
    Using your 3D model, we map each tooth’s movement in micro‑stages. You’ll preview your projected smile and estimated timeframe (most cases: 6–18 months). We also plan attachments (tiny, tooth‑coloured shapes) when needed for precise movement.
  3. Aligner fabrication
    Your custom aligner series is manufactured to apply gentle, directional forces. You’ll usually receive several sets at a time.
  4. Daily wear
    Wear aligners 20–22 hours per day, removing only for eating, drinking anything but water, brushing, and flossing. Switch to a new set every 1–2 weeks as instructed.
  5. Check‑ins and tracking
    Short in‑clinic or virtual check‑ins every 6–8 weeks to review fit, progress, and provide your next sets. We’ll adjust the plan if your biology moves faster or slower than expected.
  6. Finishing and refinements
    Near the end, we may add “refinement” aligners to perfect details like rotations or small gaps. This is common and included in many treatment plans.
  7. Retainers and long‑term stability
    Once treatment is complete, you’ll wear retainers as directed (typically nightly). Retainers preserve results by preventing natural relapse.

What results to expect (realistic outcomes)

  • Cosmetic: Straighter, more symmetrical teeth; improved smile arc; closing of mild gaps; reduced crowding overlap.
  • Functional: Easier cleaning around previously crowded areas; smoother occlusion for many mild bite cases.
  • Timeline: Visible changes in 8–12 weeks; full treatment typically 6–18 months depending on complexity and compliance.
  • Comfort: Mild pressure/tenderness 1–3 days after each aligner change; usually minimal day‑to‑day impact.

FAQs

Q: How long does Invisalign take?

Most cases finish in 6–18 months depending on complexity.

Q: How often do I change aligners?

Typically every 1–2 weeks; and you wear 20–22 hours daily (except when eating).

Q: Can Invisalign fix my bite?

Mild to moderate overbite, underbite, and cross bite can be treated; complex bites may need traditional braces or alternative treatment.

Q: Is Invisalign painful?

Expect mild pressure for 1–3 days after each change; usually well tolerated.

Quality Guarantee


You will receive a certificate and a warranty card for all dental work performed at the Dental Istria clinic led by Dr. Vladimir Kljajo in Porec, Croatia.

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