How Do Clear Aligners Work? A Step-by-Step Guide

How Do Clear Aligners Work?

Clear aligners work by applying gentle, controlled pressure to move teeth into better alignment gradually. Each aligner tray is custom-made to fit your teeth and designed to move specific teeth a little at a time as treatment progresses.

Clear aligners are removable, transparent trays made from medical-grade plastic. Unlike traditional braces that use brackets and wires, they work as a series: you switch to a new tray every 10 days to 2 weeks, and each one moves your teeth one small step closer to the planned result.

At BASMA, treatment combines orthodontist-led planning, 3D digital scans, and remote progress monitoring through the BASMA app, so you can straighten your teeth with expert care that fits around your life.

Clear Aligners at a Glance

Feature	How It Works
Starting Point	In-clinic consultation, dental checkup and 3D scan
Treatment Method	A series of custom aligner trays
Technology Used	3D digital scans, treatment planning and a 3D smile preview
Wear Time	20–22 hours daily
Aligner Changes	Every 10 days to 2 weeks
Monitoring	Orthodontist supervision through BASMA app check-ins
Typical Treatment Length	Average 6–10 months*
After Treatment	Retainers to keep teeth in place

*Treatment time varies depending on the case and patient compliance.

How Do Aligners Move Teeth?

Clear aligners move teeth through controlled orthodontic force.

Each aligner tray is shaped slightly differently from the previous one. When you wear the tray, it applies pressure to targeted teeth, encouraging them to shift position slowly.

Your teeth aren’t fused to your jawbone. Each one sits in a socket, held in place by a thin layer of tissue called the periodontal ligament. When an aligner presses on a tooth, this ligament is compressed on one side and stretched on the other. That signals the body to remodel the surrounding bone: cells on the pressure side gradually break bone down, while cells on the tension side build new bone behind the moving tooth.

The process relies on bone remodelling:

Pressure is applied to the tooth
Bone around the tooth gradually reshapes
Teeth move into new positions over time

This movement happens gradually and carefully to support safe tooth movement. It’s also why aligners move teeth in small steps rather than all at once.

What Are Attachments, and Do You Need Them?

Attachments are small, tooth-coloured bumps bonded to some teeth. They give the aligner extra grip, which can help with movements that are harder to achieve, such as rotations. Not every patient needs them; BASMA’s orthodontists decide during treatment planning, and attachments are removed at the end of treatment.

How Does Clear Aligner Treatment Work, Step by Step?

1. Consultation, Dental Checkup and 3D Scan

Treatment starts at a BASMA partner clinic with an in-clinic consultation and dental checkup, followed by a 3D scan of your teeth and dental photos.

Instead of traditional dental impressions, modern aligner treatment uses advanced 3D scanning technology to create an accurate digital model of your teeth and bite.

This scan helps orthodontists evaluate:

Tooth alignment
Bite position
Spacing and crowding
Overall suitability for aligners

2. BASMA’s Orthodontists Create Your Treatment Plan

After the scan, BASMA’s orthodontists design a personalised treatment plan showing how your teeth are expected to move throughout treatment.

This digital plan maps:

Which teeth need movement
The sequence of movements
Estimated treatment duration
Predicted final alignment

You’ll also see a 3D smile preview, a simulation of how your teeth are expected to move, before you commit to treatment.

3. Custom Aligners Are Manufactured

Once the treatment plan is approved, a series of custom aligners is created specifically for your teeth.

Each aligner:

Fits closely around the teeth
Applies targeted pressure
Represents one stage of movement

Because every set is custom-designed, aligners are tailored to the individual patient rather than using a one-size-fits-all approach.

4. You Wear Each Aligner for 10 Days to 2 Weeks

You wear each aligner tray for approximately 10 days to 2 weeks before switching to the next set.

For treatment to stay on track, aligners are usually worn:

20–22 hours per day
During sleep
Throughout most daily activities

Aligners are removed only for:

Eating
Drinking anything except water
Brushing and flossing

Consistency plays a major role in treatment success.

5. Teeth Gradually Shift Into Alignment

Every new aligner continues the tooth movement started by the previous tray.

Over time, teeth gradually move into better alignment through a sequence of small, controlled adjustments. Many patients begin noticing small changes within the first few weeks.

6. Your Progress Is Monitored Throughout Treatment

Regular monitoring helps ensure teeth are moving as planned.

At BASMA, progress is tracked through:

Remote check-ins using the BASMA app
Photo submissions after every aligner step
Clinically recommended visits when needed

If your teeth aren’t tracking as planned, BASMA’s orthodontists can adjust the plan, which may include refinements (additional aligners).

7. Retainers Keep Your Results in Place

Once your teeth reach their new positions, retainers help hold them there while the surrounding bone and tissue settle. BASMA recommends removable retainers because they hold all of your teeth, not just the front six to eight, though you can choose either removable or fixed retainers.

What Problems Can Clear Aligners Fix?

Clear aligners can treat many common orthodontic concerns.

Crowded Teeth

Teeth overlap because there isn’t enough space in the mouth.

Gaps Between Teeth

Spaces between teeth can affect appearance and bite function.

Overbite

Upper teeth excessively overlap lower teeth.

Underbite

Lower teeth extend forward beyond upper teeth.

Crossbite

Some upper teeth sit inside the lower teeth instead of outside.

BASMA treats mild, moderate and complex cases. Treatment suitability depends on the case complexity and is confirmed by BASMA’s orthodontists after your consultation and 3D scan.

Who Are Clear Aligners For, and Who Might Need Another Option?

Clear aligners may suit you if you:

Have crowding, gaps or bite issues you’d like to correct
Want discreet treatment that fits around work, sport or social life
Can commit to wearing aligners 20–22 hours a day

Another approach may be recommended if you:

Have severe jaw or skeletal issues that may need surgery alongside orthodontics
Have untreated gum disease or tooth decay, which needs treating first
Are unlikely to wear aligners consistently

How Long Do Clear Aligners Take to Work?

Most clear aligner treatments take approximately 6–10 months, although treatment length varies between patients.

Factors That Affect Treatment Time

Complexity of the case
Consistency in wear time
Patient compliance
Whether refinements are required

Wearing aligners as recommended is one of the most important factors affecting results.

What Happens If You Don’t Wear Aligners Enough?

Aligners work only when worn consistently.

Not wearing aligners for the recommended 20–22 hours daily can lead to:

Slower treatment progress
Teeth not tracking correctly
Poor aligner fit
Extended treatment time
Need for refinements

Compliance is one of the biggest factors influencing aligner success.

Do Aligners and Braces Work the Same Way?

Yes. Both aligners and braces move teeth using controlled orthodontic force. The difference is how that force is applied.

Clear Aligners	Traditional Braces
Removable trays	Fixed brackets and wires
Nearly invisible	More noticeable
Easier oral hygiene	More cleaning restrictions
No food restrictions (remove to eat)	Hard and sticky foods restricted
Fewer clinic visits	More adjustment appointments
Requires discipline	Always active

Braces may still be recommended for some severe or highly complex orthodontic cases.

What Should You Expect During Clear Aligner Treatment?

Most patients adapt to aligners quickly.

During Treatment, You Can Expect

Wearing aligners daily
Mild pressure after changing trays
Removing aligners before meals
Cleaning aligners regularly
Tracking progress digitally
A few clinical visits when needed

Many patients appreciate the flexibility aligners offer compared to braces.

Are Clear Aligners Effective?

Clear aligners can be highly effective when:

Treatment is professionally planned
Aligners are worn consistently
Progress is monitored properly
Patients follow treatment instructions

Modern aligner systems can successfully treat many mild, moderate, and some complex orthodontic cases. Research shows some movements are more predictable than others, which is why careful planning, attachments and refinements matter.

Expert Note: Aligners only move teeth while they’re in your mouth. Wear time is the single factor you control most, so treat 20–22 hours a day as part of the treatment itself, not a guideline. If a tray stops fitting snugly, tell the BASMA care team rather than skipping ahead.

Why Choose BASMA for Clear Aligner Treatment?

BASMA combines orthodontist-led care with smart digital technology to make treatment fit more naturally into everyday life. Clinics, treatment designers, manufacturing and the care team all sit within one connected platform.

With BASMA, patients receive:

An in-clinic consultation and 3D scan at a partner clinic
A personalised treatment plan and 3D smile preview
Custom clear aligners
Remote progress monitoring through the BASMA app
Support from the BASMA care team
Retainers and aftercare guidance
The BASMA Smile Guarantee

Treatment is supervised by orthodontists from start to finish, and BASMA holds the highest Trustpilot rating among invisible aligner brands in its markets.

Key Takeaways

Clear aligners move teeth with gentle, controlled pressure that triggers natural bone remodelling.
Each custom tray is worn for 10 days to 2 weeks, 20–22 hours a day.
Most treatments take around 6–10 months, depending on your case and wear time.
Mild pressure for 2–3 days after a tray change is normal.
Retainers are essential to keep your results after treatment.

Frequently Asked Questions

How Fast Do Clear Aligners Work?

Some patients notice early changes within weeks, but full treatment typically takes around 6–10 months. Your timeline depends on your case and how consistently you wear your aligners.

Do Aligners Move Teeth Permanently?

Not on their own. Teeth can shift after treatment without retainers, so retainers help maintain results long-term.

Can Clear Aligners Fix Complex Cases?

Yes. Some complex cases can be treated with aligners. Suitability is confirmed by BASMA’s orthodontists after your consultation and 3D scan.

Do You Sleep With Aligners In?

Yes. Aligners should be worn while sleeping, as night-time wear makes up a large share of the 20–22 daily hours.

Can You Drink Coffee With Aligners?

Remove your aligners before drinking coffee or anything other than plain water. Hot and coloured drinks can stain or warp the trays, so rinse your mouth before putting them back in.

What Happens After Treatment Ends?

Most patients wear retainers after treatment to help maintain their new smile. BASMA recommends removable retainers, which hold all of your teeth in place.

Ready to See How Clear Aligners Could Work for You?

Book a 3D scan at a BASMA partner clinic to find out whether clear aligners are suitable for your smile goals.

You’ll receive a professional assessment, a personalised treatment plan, and a 3D smile preview of how your smile could look after treatment, before you commit.

Sources

Krishnan V, Davidovitch Z. Cellular, molecular, and tissue-level reactions to orthodontic force. American Journal of Orthodontics and Dentofacial Orthopedics. 2006;129(4):469.e1–32.
Rossini G, Parrini S, Castroflorio T, et al. Efficacy of clear aligners in controlling orthodontic tooth movement: a systematic review. Angle Orthodontist. 2015;85(5):881–889.
White DW, Julien KC, Jacob H, et al. Discomfort associated with Invisalign and traditional brackets: a randomized, prospective trial. Angle Orthodontist. 2017;87(6):801–808.
Littlewood SJ, Millett DT, Doubleday B, et al. Retention procedures for stabilising tooth position after treatment with orthodontic braces. Cochrane Database of Systematic Reviews. 2016;(1):CD002283.