Invisalign has transformed the way thousands of people across the UK approach teeth straightening. Unlike traditional metal braces, which have been around for well over a century, Invisalign uses a series of custom-made, clear plastic aligners that gradually shift your teeth into position — without wires, brackets, or the aesthetic concerns that put so many adults off orthodontic treatment. But how exactly does the process work, from the moment you walk into a dental practice to the day you finish wearing your last aligner? This guide breaks it all down, step by step.
What Is Invisalign?
Invisalign is a brand of clear aligner therapy. Each aligner is a thin, transparent tray made from a medical-grade thermoplastic material called SmartTrack, which is proprietary to Align Technology, the company that makes Invisalign. The aligners are designed to fit snugly over your teeth and apply controlled, gentle pressure to move them incrementally into a straighter position. According to Wikipedia’s overview of clear aligners, the technology was first developed in the late 1990s and has since been used to treat millions of patients worldwide.
Each aligner in your series is slightly different from the last — each one represents the next small stage in your tooth movement plan. You wear each aligner for approximately one to two weeks before moving on to the next one in the sequence. Over months of consistent wear, your teeth gradually arrive at the position your dentist and the Invisalign software planned from the outset.
Step 1: Initial Consultation
The process begins with a consultation with your dentist or orthodontist. During this appointment, your dental professional will assess whether Invisalign is suitable for your specific case. Not all orthodontic problems can be treated with aligners — very complex bite issues or severe crowding may require traditional fixed appliances — but Invisalign is suitable for a wide range of mild to moderate cases, including crowding, spacing, and certain bite problems.
At this stage, your dentist will also take a look at the overall health of your teeth and gums. Invisalign treatment should only begin once any existing dental issues such as cavities, gum disease, or old restorations that need replacing have been addressed. This is not just a formality — starting orthodontic treatment on unhealthy teeth or gums can cause lasting damage.
Step 2: Digital Scanning and Treatment Planning
Once you’ve been confirmed as a suitable candidate, the next step is to create a precise digital record of your teeth. This is typically done using an intraoral scanner — a handheld device that captures thousands of images per second to build an accurate 3D model of your mouth. Unlike traditional dental impressions, which involved biting into a tray of putty, digital scanning is quick, comfortable, and extremely accurate.
The digital scan is sent to Invisalign’s team, who use proprietary software called ClinCheck to map out the entire treatment plan. This software allows your dentist to see a simulated before-and-after view of your teeth, showing how they are expected to move at each stage of treatment. You may be shown this simulation during a follow-up appointment so you can see what the expected end result looks like before committing.
Step 3: Aligner Fabrication
Once the treatment plan is approved, Invisalign manufactures the full series of aligners for your course of treatment. The number of aligners varies considerably depending on the complexity of the case — some patients may need as few as 10 to 15, while more complex cases can require 40 or more. All aligners for the full treatment are typically produced at once, though they are issued in batches so you are not receiving boxes of trays you won’t need for months.
Step 4: Receiving Your Aligners and Fitting Attachments
At your fitting appointment, your dentist will hand over your first set of aligners and show you how to insert and remove them correctly. In many cases, small tooth-coloured bumps called attachments are bonded to certain teeth before you start. These attachments help the aligners grip specific teeth and apply more targeted or complex forces that would otherwise be difficult to achieve with aligners alone. They are made from composite resin and blend in with your tooth colour, though they are visible up close.
Your dentist will also advise you on how long to wear the aligners each day. The standard guidance is a minimum of 20 to 22 hours per day. You remove them only to eat, drink anything other than water, brush your teeth, and floss. The more consistently you wear them, the more effective and on-schedule your treatment will be.
Step 5: Progressing Through Your Aligners
Every one to two weeks, you move on to your next aligner. Many dentists now allow patients to progress to the next tray at home, without needing a clinic appointment each time. Check-up appointments are typically scheduled every six to eight weeks so your dentist can monitor progress, ensure the teeth are tracking correctly, and address any concerns.
Some patients experience mild discomfort for the first day or two after switching to a new aligner — this is a sign the aligner is doing its job and applying pressure to move the teeth. Over-the-counter pain relief is usually sufficient if needed, and the discomfort typically fades within 48 hours.
Treatment Timeline Overview
| Treatment Stage | Typical Timeframe | What Happens |
|---|---|---|
| Initial consultation | Day 1 | Assessment, suitability check, photos and X-rays |
| Digital scan and planning | 1–2 weeks after consultation | 3D scan, ClinCheck simulation, plan approval |
| Aligner fabrication | 2–4 weeks after plan approval | Custom aligners produced by Invisalign |
| Active treatment | 6–18 months (varies by case) | Wearing aligners in sequence, regular check-ups |
| Refinements (if needed) | Mid or end of treatment | Additional aligners to fine-tune tooth position |
| Retention phase | Ongoing | Wearing retainers to maintain results |
Step 6: Refinements
In some cases, once you have completed the initial series of aligners, your teeth may not have moved quite as planned — or there may be minor adjustments the dentist wishes to make before you are finished. This is where refinements come in. Additional digital scans are taken and a new set of aligners is manufactured to address the remaining movement required. Refinements are a normal part of the Invisalign process and are included in many treatment packages. They are not a sign that something has gone wrong.
Step 7: Retainers
Once your active treatment is complete and your teeth are in their new positions, the work is not entirely over. Teeth have a natural tendency to drift back towards their original positions — this is known as relapse — and it is why wearing retainers after orthodontic treatment is essential. Invisalign provides clear retainers that are similar in appearance to the aligners but are made from a more durable material. Most dentists advise wearing retainers every night indefinitely to keep your smile stable long-term.
Is Invisalign Right for Everyone?
Invisalign is well-suited to a wide range of orthodontic cases but is not universally appropriate. Adults and older teenagers tend to be the best candidates because they are disciplined enough to wear the aligners consistently. Younger teenagers and children may be better served by fixed appliances. Similarly, very severe bite problems or skeletal discrepancies may require traditional braces or even surgical intervention.
- Suitable for mild to moderate crowding and spacing
- Effective for many bite issues including overbites, underbites, and crossbites
- Not suitable for very severe malocclusion or certain jaw problems
- Requires patient commitment to wear aligners 20 to 22 hours a day
- Removable, which makes eating, brushing, and flossing easier than with fixed braces
Caring for Your Aligners
Keeping your aligners clean is straightforward but important. Rinse them under cool water each time you remove them, clean them gently with a soft toothbrush, and avoid using hot water, which can warp the plastic. Never eat or drink anything other than cold water whilst wearing them — food particles trapped beneath the aligners can cause tooth decay, and coloured drinks can stain the trays. Storing the aligners in their case when not wearing them will keep them hygienic and prevent accidental damage.
If you are curious about whether Invisalign could work for your teeth, we would love to help. Our team at Tarbert Dental Surgery offers Invisalign consultations and can give you a clear picture of what treatment would involve for your individual case. Give us a call on 01880 820387 to book your appointment.