If you've ever wondered how a thin, clear plastic aligner can straighten teeth without brackets or wires, you're not alone. Behind this seemingly simple treatment is a carefully planned process that combines advanced 3D digital technology with your body's natural ability to remodel bone, allowing your smile to change safely over time.
In this guide, we'll explain how Invisalign works, what happens beneath the surface as your teeth move, and what to expect during your treatment journey.
How Does Invisalign Move Your Teeth?
Invisalign works by using a series of custom-made aligners, with each one designed to move selected teeth slightly closer to their ideal positions. Each tray will be worn for an average of 2 weeks, and move your teeth up to 0.25mm.
While the aligners create the force needed to move your teeth, the actual movement relies on your body's natural bone remodelling process. Understanding how this works can help you better appreciate why Invisalign treatment takes time and why wearing your aligners as instructed is important.
Bone Remodelling
Each tooth is connected to the surrounding jawbone by a thin layer of connective tissue called the periodontal ligament (PDL). This ligament acts as a cushion between the tooth root and the bone, helping absorb everyday chewing forces while keeping your teeth securely in place.1
When you wear your Invisalign aligners, gentle pressure is applied to selected teeth. In response, your body begins a natural remodelling process:
Controlled Pressure
Each Invisalign aligner is engineered to apply a precise amount of force to specific teeth at different stages of treatment. Rather than shifting all of your teeth simultaneously, the pressure is carefully directed towards the teeth that need to move, allowing them to move according to your personalised treatment plan.
This controlled approach helps ensure tooth movements occur gradually and predictably, reducing unnecessary stress on the surrounding teeth and supporting tissues.
Features of Invisalign Aligners
Invisalign aligners incorporate several proprietary features that work together to support effective tooth movement throughout treatment. From the material used to manufacture the aligners to specialised attachments for more complex cases, each feature is designed to improve fit, comfort and treatment precision.
Invisalign aligners are made from SmartTrack™, a proprietary multilayer thermoplastic material developed specifically for orthodontic treatment. Unlike standard clear plastic, SmartTrack is engineered to provide a balance of flexibility, durability and consistent force, allowing the aligners to fit comfortably while supporting predictable tooth movement.
The material was developed after years of research and testing to improve how aligners fit, move teeth and adapt to everyday wear. It is also BPA-free and designed for prolonged daily use throughout your treatment.
Some Invisalign treatments may require SmartForce™ attachments to help achieve more complex tooth movements. These are small, tooth-coloured composite shapes temporarily bonded to selected teeth, allowing the aligners to grip more effectively and apply force in the planned direction.
Depending on your treatment plan, SmartForce™ attachments may be used to rotate teeth, improve root control, move teeth vertically or help correct certain bite issues.
Benefits of Straightening Teeth With Invisalign
Besides straightening your teeth, Invisalign aligners are designed to provide a treatment experience that is discreet, comfortable, and convenient for everyday wear.
Invisalign aligners are made from clear plastic, making them much less noticeable than traditional metal braces. This makes them a popular choice for adults and teenagers who prefer a less noticeable option.
Unlike traditional braces, Invisalign aligners can be removed when brushing and flossing. This makes it easier to clean your teeth thoroughly throughout treatment, helping to reduce plaque build-up and support healthier gums.
Each set of Invisalign aligners is custom-made to fit your teeth. Without metal brackets or wires, they are less likely to cause irritation to the cheeks, lips, or gums, making them a comfortable orthodontic option for many patients.
How Is Your Custom Invisalign Treatment Plan Developed?
Before your Invisalign treatment begins, your dentist uses advanced digital technology to create a personalised treatment plan tailored to your teeth and bite.
Using the iTero Element® scanner, your dentist captures thousands of images of your teeth to create a highly accurate 3D digital model of your mouth within just a few minutes. This model provides precise measurements of your teeth and bite, providing the detailed information needed for your Invisalign treatment.
Key benefits of iTero Element® include:
- Greater comfort: Captures a digital scan in 2–3 minutes, without the discomfort of traditional impressions
- Higher accuracy: Produces a highly detailed 3D model to support precise treatment planning
- Improved efficiency: Digital scans are sent directly to Align Technology for aligner fabrication, reducing waiting time
The completed 3D digital model is then imported into the ClinCheck® software for treatment planning. Your dentist will map out the planned movement of each tooth from the beginning to the end of treatment.
ClinCheck® also generates an interactive 3D simulation, giving you a preview of how your teeth are expected to move and what your smile may look like after Invisalign treatment.
*The ClinCheck® software provides a simulated outcome only. Actual treatment outcomes may differ from the simulated outcome.
At i.Dental, every Invisalign treatment begins with a comprehensive digital assessment. Book an appointment to take the first step towards a straighter smile.
Post Treatment: What Happens After Invisalign Treatment?
Once your Invisalign treatment is complete and your teeth have reached their planned positions, you'll usually be fitted with a custom retainer to help maintain your new smile. There are different types of retainers available, and your dentist will recommend the most suitable option based on your treatment outcome and long-term orthodontic needs.
FAQs on How Invisalign Works
Invisalign is suitable for children, teenagers and adults.
With tailored treatment plans, including Invisalign First for children aged 6 - 10 years old and Invisalign Teen for adolescents, these treatments can address orthodontic concerns at different stages of dental development.
Early orthodontic treatment may be recommended for some children to guide jaw growth and address developing dental issues before they become more complex. However, not every child requires early treatment.
Your dentist will assess your teeth and bite to determine whether Invisalign is the most suitable option.
The length of Invisalign treatment varies depending on the complexity of your case. Mild cases may take as little as 6-12 months, while more complex cases can take 2-3 years or longer.
Your treatment duration is influenced by factors such as the amount of tooth movement required, the complexity of your bite, and how consistently you wear your aligners. Wearing your aligners for the recommended 20–22 hours per day and attending your scheduled review appointments can help keep your treatment on track.
Most patients change to a new set of Invisalign aligners every 1–2 weeks, although the exact schedule depends on your personalised treatment plan and your dentist's recommendations.
Each aligner is designed to move your teeth by a small amount before progressing to the next stage. Changing your aligners too early or too late may affect how well your teeth track according to the treatment plan, so it is important to follow your dentist's instructions throughout treatment.
While Invisalign offers many benefits, it may not be suitable for everyone. Some potential limitations include:
- Higher cost: Generally costs more than traditional metal braces as it involves customised aligners, advanced digital treatment planning and proprietary technology
- Requires discipline: Aligners need to be worn for 20–22 hours a day to achieve the planned treatment outcome
- Temporary speech changes: Some patients may notice a slight lisp during the first few days of wearing new aligners, but this usually improves as your mouth adapts
- Risk of losing aligners: Can be misplaced or accidentally damaged if they are not stored properly when removed
Invisalign does not change your jawline. However, as your teeth become better aligned and your bite improves, some patients may notice subtle changes to their facial profile, such as the appearance of their lips or cheeks.
The 30-minute rule refers to putting your Invisalign aligners back on within 30 minutes whenever they are removed. Leaving your aligners out for extended periods may reduce the amount of time they are worn each day, which can affect how well your teeth track according to your treatment plan.
Both orthodontic treatments are clinically proven to correct smiles. Deciding between the two is largely dependent on your priorities and personal preferences.
Some factors to consider would include
- Visibility
- Comfort
- Dietary restrictions
- Budget
- Discipline
- Frequency of follow-up visits
Most people experience mild pressure or discomfort for the first few days after starting Invisalign treatment or changing to a new set of aligners. This is a sign that the aligners are gradually moving your teeth into their planned positions. The discomfort is generally mild and temporary, and most people adapt within a few days.
The cost of Invisalign depends on the complexity of your case and the number of aligners required. During your consultation, your dentist will assess your teeth, discuss your treatment goals, and provide a personalised treatment plan with an estimated cost.
Yes, Invisalign can be just as effective as braces when worn as instructed. It is suitable for treating most cases, including crowded teeth, gaps and certain bite problems.
For certain tooth movements, your dentist may recommend the use of Invisalign attachments or other accessories to help the aligners achieve more precise tooth movement.
Yes, Invisalign can correct many cases of crooked teeth by gradually moving them into better alignment using a series of custom-made clear aligners. The suitability of Invisalign depends on the severity and complexity of the misalignment, which can be assessed during a consultation.
Yes. A dentist can provide Invisalign treatment if they have completed the necessary Invisalign training and certification.
Invisalign differs from other clear aligners through its combination of proprietary technology, digital treatment planning and extensive clinical research.
As of December 2025, Invisalign has corrected the smiles of 22 million patients with the proprietary ClinCheck® software and patented features of the aligners.2
References:
- Martineli Filho, Waldir. "Advances in Bone Remodeling and Clear Aligners in Orthodontics." International Seven Journal of Multidisciplinary, 12 Nov. 2024. Available from: https://sevenpubl.com.br/ISJM/article/view/6007
- Align Technology. "Invisalign® Clear Aligners & Teeth Straightening." Invisalign.com, n.d. Available from: https://www.invisalign.com.sg/
