Most people considering Invisalign have a general sense of what it is: clear trays that straighten teeth without metal brackets or wires. What they are less clear on is how the process actually works from start to finish, what the technology behind it involves, and what makes it meaningfully different from traditional braces in clinical terms rather than just cosmetic ones. This guide covers all of it, step by step, with enough depth to give patients a genuine understanding of what they are committing to before they sit down for a consultation.
Key Takeaways
- Invisalign uses a series of custom-made, BPA-free clear plastic aligners manufactured from USP Class VI medical-grade polyurethane resins, each designed to move teeth in small, precise increments.
- My Orthodontist uses an iTero 3D intraoral scanner to capture digital impressions of the bite, which feeds directly into the custom treatment plan and allows patients to preview their expected results before treatment begins.
- Aligners are changed approximately every seven days, with brief check-in appointments approximately every six weeks to review progress.
- The duration of treatment is determined by the orthodontist based on the severity of misalignment, bite complexity, and the amount of movement required.
- Invisalign is available for children through Invisalign First, teenagers through Invisalign Teen, and adults, each with product-specific features suited to the developmental needs of each age group.
Table of Contents
- How do Invisalign aligners actually move teeth?
- Why the iTero 3D scan is the foundation of the entire process
- How a customised treatment plan gets built
- What wearing aligners day to day actually involves
- How Invisalign differs across children, teens, and adults
- What happens at the end of treatment
- What Invisalign cannot do and why that matters
How do Invisalign aligners actually move teeth?
Understanding what Invisalign is doing mechanically helps patients make sense of the rest of the process. The aligners are not simply holding teeth in position. They are applying controlled, directional force that triggers a biological response in the bone and ligament tissue surrounding each tooth root.
When pressure is applied to a tooth in a specific direction, the periodontal ligament that holds the root in the jaw socket responds by signalling bone cells on the tension side to lay down new bone and bone cells on the pressure side to resorb existing bone. This remodelling process is what allows the tooth to move. It is the same mechanism that braces use. The difference with Invisalign is that the force is delivered through the precise geometry of each aligner tray rather than through wire tension.
Each aligner in the series is manufactured to be slightly different from the one before it, positioning the teeth incrementally closer to their target position. The orthodontist maps exactly how much movement occurs at each stage when building the treatment plan. This is not an approximate process. The American Association of Orthodontists recognises Invisalign as a clinically validated orthodontic treatment for a defined range of conditions, and the precision of the planned tooth movement is a central part of how that clinical outcome is achieved.
Why the iTero 3D scan is the foundation of the entire process
At My Orthodontist, the Invisalign process begins with an iTero intraoral 3D scanner rather than traditional physical impressions. This distinction matters more than it might initially appear.
The iTero scanner captures a complete digital model of the patient's teeth and bite by scanning the mouth directly. The image is projected on screen in real time, giving the orthodontist and patient a full 360-degree view of the current smile from every angle. This level of detail is what makes an accurate custom treatment plan possible.
From the same scan, the iTero Smile Simulator generates a 3D rendering of what the patient's smile may look like by the end of treatment. Patients can see a projected outcome before a single aligner is produced. This is not a sales tool. It is a clinical communication tool that allows the orthodontist to align treatment goals with the patient's expectations before any commitment is made, and to identify cases where the patient's desired outcome differs from what is clinically achievable.
The scan data is then transmitted directly to Invisalign's manufacturing process, where the full series of custom aligners is produced to exact specifications based on the treatment plan the orthodontist has designed. The elimination of physical impression materials also removes a common source of inaccuracy in aligner manufacturing, since digital scans capture finer detail than traditional putty impressions.
How a customised treatment plan gets built
Once the scan is complete, the orthodontist maps the full treatment plan using the digital model. Every tooth movement across every stage of treatment is planned in advance. The orthodontist knows exactly how much each tooth will move with each aligner, how many aligners the full treatment will require, and what the projected timeline looks like before the first tray is ever worn.
This upfront planning is one of the defining clinical features of Invisalign compared to braces, where treatment is adjusted progressively at each appointment based on how teeth are responding. With Invisalign, the entire movement sequence is modelled before treatment begins, which gives both the orthodontist and the patient a clear picture of the path ahead.
The number of aligners in a patient's series and the total treatment duration are determined by:
- The severity and complexity of the misalignment or bite issue being corrected
- The amount and direction of movement required for each individual tooth
- Whether any bite corrections are involved alongside alignment changes
- The patient's age and the specific Invisalign product being used
Treatment fees at My Orthodontist vary depending on the severity of the case and the length of treatment required. The treatment cost calculator on the patient resources section provides an approximate starting point for patients researching their options before a consultation.
What wearing aligners day to day actually involves
Invisalign aligners must be worn for a minimum of 22 hours per day to achieve the planned tooth movement on schedule. They are removed only for eating, drinking anything other than water, brushing, and flossing. This wear requirement is not optional. Consistent wear is directly connected to treatment outcomes. Patients who regularly wear aligners for fewer hours than prescribed will experience slower progress and potentially require additional aligners to complete treatment.
Each set of aligners is worn for approximately seven days before switching to the next set in the series. Check-in appointments with the orthodontic team occur approximately every six weeks, at which point the orthodontist reviews progress, confirms that teeth are tracking as planned, and addresses any questions. These appointments are brief because there are no adjustments to make in the traditional sense. The orthodontist is monitoring the treatment rather than modifying it at each visit.
Aligners are cleaned by rinsing them each time they are removed, soaking them with a denture cleaner, Retainer Brite, or Invisalign cleaning crystals, and brushing them gently with a clear anti-bacterial soft soap before rinsing. Patients should brush and floss before reinserting aligners to avoid trapping food debris or bacteria between the tray and the teeth. Full cleaning guidance is covered in detail in the Invisalign FAQs section.
One practical note on sports and instruments: aligners must be removed for contact sports to protect both the trays and the teeth, but because the minimum wear time is 22 hours, time away from aligners needs to be planned carefully across the day. Patients who play instruments can remove aligners to practice and replace them afterward.
How Invisalign differs across children, teens, and adults
Invisalign is not a single product. The system includes distinct aligner lines developed for different patient groups, each with features that address the specific clinical and lifestyle realities of that age group.
Invisalign First is designed for younger children, often incorporated as part of Phase 1 orthodontic treatment to guide jaw development and address structural issues while growth is still occurring. The aligners include design features that accommodate teeth that are still emerging.
Invisalign Teen adds two features specifically relevant to teenage patients. Compliance indicators are small blue dots built into the aligner that fade after approximately two weeks of consistent wear, giving both teens and parents a visible signal of whether aligners are being worn as required. Eruption tabs are also built in, creating space for second molars that may still be coming through during treatment. Six sets of replacement aligners are included within the Invisalign Teen system to account for the reality that aligners can be lost or damaged.
For adults, the standard Invisalign system addresses the full range of alignment and bite conditions that fall within its clinical scope. Adults can also preview their results before treatment begins using the iTero Smile Simulator, which is particularly valuable for patients who have specific aesthetic goals alongside clinical ones.
The right version for any patient is determined at the consultation after the orthodontist assesses the clinical picture. My Orthodontist is a Diamond+ Invisalign provider, a designation based on treatment volume that reflects significant case experience across all three patient groups.
What happens at the end of treatment
When the final aligner in the series has been worn and the planned tooth movement is complete, the orthodontist reviews the outcome at the last scheduled appointment. In some cases, additional refinement aligners may be prescribed if any teeth have not moved exactly as planned. This is a normal part of Invisalign treatment and does not indicate a problem. The refinement phase is simply an extension of the original plan to achieve the target result.
At the conclusion of treatment, a retainer is prescribed. This is a non-negotiable part of any orthodontic treatment, Invisalign or otherwise. Teeth that have been moved will tend to drift back toward their original positions if nothing is holding them in place. The retainer is what maintains the outcome achieved during treatment over the long term.
Retainer wear instructions are provided at the final appointment. Patients are responsible for following them as directed, storing retainers properly when not being worn, and contacting the practice promptly if a retainer is lost or damaged.
What Invisalign cannot do and why that matters
Invisalign is clinically effective across a broad range of conditions including overcrowded teeth, widely spaced teeth, crossbite, overbite, underbite, and certain complex bite issues. It is not suitable for every orthodontic case.
The primary limitation is jaw bone malpositioning. Cases where the bite problem is rooted in the structural position of the jaw itself, rather than in tooth position within the jaw, require the mechanical forces of fixed appliances to correct reliably. Invisalign moves teeth. It does not reposition jaw bones.
Some patients with mixed clinical pictures use a hybrid approach, completing a phase of treatment with braces to address elements that fall outside what Invisalign can achieve, before transitioning to aligners to complete alignment. This is a clinical decision made case by case.
Whether Invisalign is appropriate for a specific patient is determined through a full clinical examination by the orthodontist. The online Smile Assessment on the My Orthodontist website provides a 30-second starting point for patients who want a preliminary sense of their suitability before booking a consultation. No referral is required to attend, and there is no obligation after the initial visit.
Frequently Asked Questions
What are Invisalign aligners made of? Invisalign aligners are made from USP Class VI medical-grade, high-molecular-weight polyurethane resins. They are BPA-free.
How often do I need to visit the orthodontist during Invisalign treatment? Check-in appointments are scheduled approximately every four to six weeks. Because aligner changes are managed by the patient at home, visits are less frequent than for patients in braces and focused on progress review rather than mechanical adjustment.
Can I eat whatever I want with Invisalign? Yes. Because aligners are removed for eating, there are no dietary restrictions during Invisalign treatment. Aligners should be removed before consuming beverages that could stain the trays, including wine, coffee, and dark sodas.
Is Invisalign treatment the same length as braces? Not necessarily. Duration depends on the specific clinical case. Some Invisalign cases are shorter than equivalent braces treatment would be. Others are comparable. The orthodontist outlines a projected timeline at the consultation based on the individual case after reviewing the scan.
Conclusion
Invisalign is a clinically precise treatment system built around digital planning, custom manufacturing, and consistent patient compliance. Understanding how it works from the biology of tooth movement through to the final retainer gives patients a more realistic picture of what treatment involves and what it asks of them. My Orthodontist offers Invisalign across all age groups, supported by iTero scanning technology and the clinical depth that comes from being a Diamond+ provider. The most accurate way to understand how the process would work for a specific case is a consultation with an orthodontist who has reviewed the actual clinical picture.