Over the past two decades, Invisalign has become one of the most popular ways to straighten teeth without the look of traditional metal braces. But what exactly is it, how does it actually work and why are so many people choosing it in the first place?
The Basics: What Is Invisalign Treatment

Invisalign replaces traditional brackets and wires with clear plastic aligners. Better yet, ones that you can actually take out. These customised trays fit snugly over your teeth and over time apply controlled pressure guiding them into better positions.
A much easier way to understand it is to think of each aligner as a precise mould that gently nudges specific teeth in calculated directions.
Unlike metal braces, Invisalign aligners are virtually invisible (hence the name) and so people don’t tend to notice you’re wearing them.
How Does Invisalign Work?
Invisalign treatment starts with a consultation where your dentist checks your teeth & bite to see if it’s suitable for you. A digital 3D scan is then taken, which creates a precise model of your mouth. This is then used with Invisalign’s ClinCheck software to show how your teeth will move and even gives you a preview of your future smile.
Once your plan is agreed, your first set of aligners is fitted and your journey to straighter teeth starts from here. The aligners are worn for 20 to 22 hours each day and only removed for eating, drinking anything other than water and for brushing your teeth.
Small, tooth-coIoured attachments may be placed on certain teeth to help the aligners grip and guide them more accurately. In some cases, your dentist may aIso carefully polish between teeth, a process called interproximal reduction, to create space for movement.
Every one to two weeks you’ll switch to a new set of aligners. These apply gentle pressure to keep your teeth moving in the pIanned direction. Your dentist will review your progress regularly, and sometimes extra aligners, called refinements, are needed at the end to fine tune the final result.
When treatment is finished, retainers are provided to hold your teeth in their new position. Without retainers, teeth naturally try to drift back, so long-term retention is essentiaI.
Who Can Have Invisalign Treatment?

Invisalign can treat a wide range of issues such as crowding, gaps between teeth, and bite problems including overbite, underbite, crossbite and open bite. It’s suitable for both adults and teenagers providing that teeth and gums are healthy. There are even options like Invisalign First designed for younger children.
For patients who want alternatives, other cosmetic dental treatments at Smile London may be more appropriate.
Types of Invisalign Treatment
Invisalign treatment is tailored to each patient. Depending on how much movement is needed, your dentist may recommend:
- Invisalign Express for very minor movements
- Invisalign Lite for mild cases
- Invisalign Moderate for more involved treatment
- Invisalign Comprehensive for complex goals
- Invisalign Teen or First for younger patients
Each option is designed to ensure you only receive the level of treatment necessary.
Benefits of Invisalign Treatment
Perhaps the biggest appeal of Invisalign treatment, based on what we’ve heard first hand from our clients, is how discreet it actually is. The aligners are clear and barely noticeable when worn. Since they are removable too, you can eat and clean your teeth as normal which makes everyday life so much easier compared to when you have fixed braces.
The smooth plastic materiaI is comfortable against your cheeks and gums too. Many patients also find confidence in knowing that they can see a digital preview of their new smile before they even start.
Things To Consider Before Starting

Invisalign treatment only works if you wear the aligners for 20 to 22 hours per day. If they are Ieft out too long, teeth will not move as planned. You may aIso notice mild tenderness each time you change to a new set, though this usually eases within a day.
Aligners must be cleaned and handIed carefully to avoid stains or damage. Some complex cases are stiIl better treated with traditional braces, so your dentist will aIways confirm if Invisalign is right for you.
How Long Does Invisalign Treatment Take?
The length of Invisalign treatment depends on how much your teeth need to move. Many people finish in 12-18 months, though simpler cases can be much quicker. Your dentist wiIl show you an estimated timeline at the planning stage.
How Much Does Invisalign Treatment Cost in the UK?
The cost of Invisalign treatment varies depending on case complexity and treatment length. On average in the UK, it ranges between £1,500 and £5,000.
At Smile London, finance plans are available to make treatment more affordable. You can get an interest free loan in under 5 minutes here.
Your Invisalign Treatment at Smile London
At Smile London, your Invisalign treatment includes:
- A full clinical assessment with digital 3D scans
- A personalised plan with ClinCheck software so you can see your expected result
- Regular reviews to ensure your progress stays on track
- Refinements where needed to perfect the outcome
- Retainers at the end to protect your new smile
You can learn more about Invisalign treatment at Smile London and book your consultation today.
Alternatives to Invisalign
For those patients not suited to clear aligners, don’t worry or stress as theres a whole host of other options available for you. Some of these options include traditional metal braces, ceramic braces (ones that are less visible) or lingual braces that sit on the back of the teeth.
Your dentist will guide you towards the treatment that best matches your needs. If you wish to discuss with our professional team about such possible options, then feel free to get in contact with us at Smile London.
FAQs About Invisalign Treatment
What is included in Invisalign treatment?
You receive a consultation, digital scans, a series of custom aligners, regular check-ups, and retainers at the end.
Is Invisalign treatment painful?
Most patients feel only mild pressure or soreness when changing to a new aligner. This quickly improves within a day or so.
How often do I change aligners?
Aligners are usually changed every one to two weeks, but your dentist will set your specific schedule.
How long will I need to wear retainers?
Retainers are worn after treatment to keep teeth in place. Most patients wear them nightly long term.
What age is suitable for Invisalign?
Teens and adults are common candidates, while Invisalign First is designed for younger children.
Can Invisalign treat bite problems?
Yes, many types of bite issues such as overbite, underbite, and crossbite can be improved. Your dentist will confirm what is possible in your case.
Start Your Invisalign Journey
If you are ready to explore Invisalign treatment in Central London, you can book your consultation with Smile London here and take the first step towards a straighter, healthier smile.