Last updated: January 23, 2026
Direct answer: Clear aligners straighten teeth by applying gentle, controlled pressure through a planned series of trays that move teeth in small steps. You switch aligners on a schedule, and each tray advances the position slightly until the final alignment is achieved.
If you’ve ever wondered how something removable can be powerful enough to shift teeth, the secret isn’t the plastic—it’s the plan.
The biology behind aligners (why teeth actually move)
Teeth move because bone remodels in response to sustained pressure:
- bone changes where pressure is applied
- the tooth gradually shifts
- the body stabilizes the new position over time
Aligners harness this process using small, repeatable steps.
The aligner system: trays, attachments, and consistency
The trays
Each tray is manufactured to nudge specific teeth.
Attachments
Small tooth-colored bumps help aligners grip and rotate teeth more effectively.
Wear time
This is the biggest success factor. Aligners generally need to be worn most of the day to be effective.
What to expect week to week
First few days of a new tray
Tightness and pressure are normal—this is how you know it’s working.
First month
Routines get easier, and changes may be subtle but meaningful.
Mid-treatment
Visible improvements increase. Refinements may be added for precision.
What aligners are great for (and when you may need another option)
Aligners work well for many cases of crowding and spacing. More complex bite issues may still be treatable—depending on planning, compliance, and attachments—while some cases may do better with braces or a hybrid approach.
Tips that make results easier
- tell your dentist if you grind/clench
- keep a case with you
- remove aligners only for eating and cleaning
- avoid sugary drinks with aligners in
- clean trays gently with cool water
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