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Invisalign: How It Works and Who It Suits

Invisalign is popular, but it is not right for every smile. This guide explains who it suits, who it does not and what the research says.

Key points

  • Invisalign is a series of removable, custom-made clear plastic trays, and each tray moves the teeth a small distance.
  • A review of 22 studies found it a viable alternative to conventional treatment for mild to moderate problems in non-growing patients who do not need extractions.1
  • The same review found limited effectiveness for some movements, such as widening the arch by moving teeth bodily and closing extraction spaces.1
  • Aligners only work when worn, day and night except at meals, so a plan depends on your daily habits.2
  • Retainers are required after aligner treatment, and a proper assessment must come before it starts.

Invisalign is one of the best-known clear aligner systems, and many people ask about it first. The questions that matter are not only what it is, but whether it will work for your teeth. Here is a balanced view.

What Invisalign is

It is a series of removable, custom-made clear plastic trays. You wear a series of them, and each moves the teeth a small distance before the next takes over.2 They need to be worn full-time, day and night, except at meal times.2 Our guide to how Invisalign works describes the process step by step.

Who it suits

A systematic review of 22 studies of Invisalign found that it is a viable alternative to conventional treatment for mild to moderate problems in people who have stopped growing and who do not need extractions, and that it can level, tip and turn most teeth predictably.1 Typical candidates are:

  • adults whose teeth have finished growing and who have mild to moderate irregularity;1
  • people whose teeth can be lined up without extractions;1
  • people whose lifestyle or work makes visible fixed braces difficult;2
  • people who will wear the aligners full-time and attend their reviews.2

Who may need something else

The same review found limited effectiveness for widening the arch by moving teeth bodily, closing extraction spaces, correcting contacts between upper and lower teeth and larger front-to-back or vertical problems.1 The British Orthodontic Society also says that people with severe crowding or complex tooth movements, or whose problem comes from the size or position of the jaws, may need other techniques, as may people who find it hard to wear trays most of the day and night.2 Some problems need additional techniques, such as fixed appliances, alongside aligners.2

What the evidence says in full

For Invisalign specifically, the research supports mild to moderate problems in non-growing patients who do not need extractions, and the authors say no clear clinical recommendations can be made beyond that.1

For aligners in general, a review of 11 studies with 887 patients found moderate-quality evidence of a worse occlusal result than with fixed braces, and concluded that the evidence does not support aligners as equally effective.3 Another review said the evidence for the effectiveness of aligners is generally lacking.4 It is therefore wise to treat any claim of equal or better results with some caution, and to ask your orthodontist what is realistic for your teeth.

Comfort and cleaning

A review found that pain with Invisalign was lower than with fixed braces in the first days, and no different after that, up to three months.5 In a meta-analysis of 7 studies with 368 patients, plaque and bleeding scores were lower with Invisalign than with fixed braces, so the teeth appear easier to keep clean.6

Duration

One review found no difference in treatment duration between aligners and braces, and another found shorter treatment and less chair time in mild to moderate cases.34 How long your own treatment takes depends on your teeth, and your orthodontist can give a range after assessing them.

What Invisalign asks of you

  • Wearing the trays for the hours advised, day and night.
  • Taking them out to eat, and cleaning your teeth before putting them back.
  • Keeping them clean and in their case.
  • Attending reviews.
  • Wearing retainers afterwards.

Aligners only work when worn, so a plan depends on your daily habits.2

A good consultation

A proper orthodontic assessment, diagnosis and treatment plan is essential to successful aligner treatment, so aligners should not be started without an examination.2 A good consultation includes:

  1. an examination of your teeth, gums and bite, with X-rays, photographs or scans;7
  2. a clear statement of what Invisalign can and cannot do for you;
  3. a view of the planned movements;
  4. an explanation of attachments, if they are planned;
  5. a plan for retention.

Our article on Invisalign attachments explains one part of the plan, and our comparison of aligners and braces looks at the alternatives.

Questions to ask before starting

  • Are my teeth in the group the research supports?
  • What can this treatment not do for me?
  • What happens if the aligners do not give the result planned?
  • How many aligners are planned, and for how long?
  • How often will I be seen?
  • What will I wear afterwards?

After the treatment

After any aligner treatment, retainers are required so that the teeth keep their corrected positions.2 See our guide to retainers.

More about aligners

You can read about the options on our pages for Invisalign and clear aligners.

Aligners and daily life

Most people find aligners fit around work and social life, with a few adjustments.

  • At work: take the trays out for meetings only if you need to, and always for meals. A case in your bag or desk keeps them from getting lost.
  • Speaking: a slight lisp usually settles within days as your tongue adapts. Reading aloud helps.
  • Eating out: take the trays out, eat, brush or rinse and put them back. Do not eat with them in.
  • Exercise: you can wear them, but a mouthguard may be needed for contact sports, so ask your orthodontist.
  • Photographs: attachments, which are small tooth-coloured bumps, may be visible up close, although the trays are clear.

Aligners work well when the routine becomes automatic, so set reminders to put the trays back after meals in the first month.

Questions about the provider's experience

Aligner systems are used by many dentists, so it is reasonable to ask about the person who will plan your treatment.

  • What training do you have in orthodontics and in aligners?
  • How many aligner cases like mine have you treated?
  • Who will review me, how often and where?
  • What happens if my teeth do not follow the plan?
  • Will I see the planned tooth movements before starting?
  • Who do I call if a tray breaks?

A proper assessment is essential, and a provider who answers these questions clearly is more likely to plan carefully.2

When a refinement is needed

Not all plans work exactly as first designed. If the teeth do not reach the planned position after the last tray, the dentist may take another scan and order a few more trays, called a refinement. It is common and does not usually mean you did anything wrong, but it does add time. Ask at the start whether refinements are included in the plan, how long they usually take and how many visits they may need.

Myths and facts about Invisalign

Myth: Invisalign is for everyone. Research supports it for mild to moderate problems in non-growing patients without extractions.1

Myth: aligners are always faster. One review found no difference in treatment duration, and another found shorter treatment in mild to moderate cases.34

Myth: aligners are invisible. The trays are clear, but they can be noticed, and attachments are visible up close.

Fact: wearing them is the main thing you control. Day and night, except at meals.2

Practical advice for the first month

  • Set reminders to put the trays back in after meals.
  • Carry a case, a small brush and a travel toothbrush.
  • Expect soreness for a day or two with each new tray.
  • Tell your dentist if a tray does not seat fully.
  • Keep every appointment, and bring your spare trays.

Frequently asked questions

Is Invisalign suitable for teenagers?

Research supports it in people who have stopped growing, so teenagers' suitability depends on their stage of growth, and your orthodontist decides.1

Can Invisalign fix an underbite or overbite?

Limited effectiveness was found for larger front-to-back problems, so it depends on the case.1

Do I need a retainer?

Yes, after any aligner treatment.2

Will I need to wear the aligners all the time?

Yes, day and night, except at meals.2

Can Invisalign be used with fillings and crowns?

Often, yes, though restorations may affect where attachments are placed. Tell your dentist about earlier work.

What if I do not wear the trays enough?

Treatment may slow or go off plan, and your orthodontist may need to adjust it.

Can Invisalign fix severe crowding?

Severe crowding or complex tooth movements may need fixed braces or other appliances. The research supports aligners for mild to moderate problems, so your orthodontist will tell you which group you are in.1

Do I have to wear attachments?

Not always. Attachments are small bumps bonded to some teeth to help the trays grip, and they are used when the plan calls for them. Your orthodontist will tell you if you need them.

About the author

Portrait of Dr Anupam Sinha

Dr Anupam Sinha, BDS, MDS – Orthodontics. BDS (2002), KLE Vishwanath Katti Institute of Dental Sciences, Belgaum. MDS in Orthodontics (2006), SDM College of Dental Sciences, Dharwad. His thesis work won a national research award in 2005, and he holds a certification in aesthetic dentistry. He sees patients at Orion Dental Clinic in Greater Kailash 1, South Delhi. Read the full profile of Dr Anupam Sinha.

Sources

  1. Papadimitriou A, Mousoulea S, Gkantidis N, Kloukos D. Clinical effectiveness of Invisalign orthodontic treatment: a systematic review. Progress in Orthodontics, 2018;19(1):37. https://pubmed.ncbi.nlm.nih.gov/30264270/
  2. British Orthodontic Society. Clear aligners (patient information leaflet). https://www.bos.org.uk/Public-Patients/Patient-Information-Leaflets/Clear-Aligners
  3. Papageorgiou SN, Koletsi D, Iliadi A, Peltomaki T, Eliades T. Treatment outcome with orthodontic aligners and fixed appliances: a systematic review with meta-analyses. European Journal of Orthodontics, 2020;42(3):331-343. https://pubmed.ncbi.nlm.nih.gov/31758191/
  4. Zheng M, Liu R, Ni Z, Yu Z. Efficiency, effectiveness and treatment stability of clear aligners: a systematic review and meta-analysis. Orthodontics and Craniofacial Research, 2017;20(3):127-133. https://pubmed.ncbi.nlm.nih.gov/28547915/
  5. Cardoso PC, Espinosa DG, Mecenas P, Flores-Mir C, Normando D. Pain level between clear aligners and fixed appliances: a systematic review. Progress in Orthodontics, 2020;21(1):3. https://pubmed.ncbi.nlm.nih.gov/31956934/
  6. Lu H, Tang H, Zhou T, Kang N. Assessment of the periodontal health status in patients undergoing orthodontic treatment with fixed appliances and Invisalign system: a meta-analysis. Medicine (Baltimore), 2018;97(13):e0248. https://pubmed.ncbi.nlm.nih.gov/29595680/
  7. NHS website. Braces and orthodontics (patient information). Page review date 29 June 2026. https://www.nhs.uk/conditions/orthodontics/

Medically reviewed by Dr Anupam Sinha, BDS, MDS – Orthodontics, on . General information for patients from Orion Dental Clinic, last updated 23 October 2026. It is not advice for one person, so ask a dentist what suits you. To report an error, contact us.