Why daily cleaning matters
Since aligners are worn up to 22 hours a day, bacteria and plaque can build up quickly on the plastic. Rinsing them every time they come out and brushing them gently each day protects both the aligners and oral health.
A simple daily routine keeps aligners clear, fresh, and working the way they should, while skipping cleaning can leave trays looking cloudy or discolored over time. Over time, that buildup can also raise the risk of gum irritation and cavities along the edges the trays cover.
The best way to clean aligners
The best approach combines quick rinsing throughout the day with a thorough cleaning at least once daily. Rinsing with cool or lukewarm water removes saliva and loose debris before it dries on the plastic, while daily brushing clears away the plaque film that rinsing alone cannot remove.
A consistent routine takes only a few minutes: rinse the aligners every time they come out, gently brush the inside and outside with a soft-bristled toothbrush, and use a small amount of clear, unscented antibacterial soap. Soaking them in aligner cleaning crystals or a dentist-approved solution when recommended, then rinsing thoroughly before placing them back in the mouth, completes the routine.
How often this full routine is needed can depend on individual habits. Rinsing after every removal is always a good idea, while the deeper brushing and soak are usually done once a day, ideally in the morning or before bed.
What to avoid when cleaning aligners
Some common cleaning habits can damage or discolor aligners. Hot water can warp the plastic and affect how well the trays fit, and toothpaste is often too abrasive, leaving scratches that make aligners look cloudy. Colored soaps, bleach, and alcohol-based mouthwash can also stain or weaken the material, so it is best to stick with clear, unscented products made for cleaning plastic trays.
Why do aligners look cloudy?
Cloudiness usually comes from plaque buildup, fine scratches, or mineral deposits that settle on the plastic over time. Using toothpaste or skipping daily cleaning tends to make the problem worse, since both leave residue that dulls the clear finish. Gentle brushing with a soft toothbrush and clear soap, along with a regular soak, can help keep trays looking close to invisible.
Keeping the case clean too
An aligner case can collect bacteria just as easily as the trays themselves. Rinsing the case daily and washing it with mild soap and water a few times a week, then letting it air dry completely before storing the aligners inside, helps prevent odors and keeps aligners fresh between uses.
Why oral hygiene still matters
Clean aligners work best when the teeth underneath them are clean as well. Brushing and flossing before putting aligners back in after meals prevents food and sugar from being trapped against the teeth, which lowers the risk of cavities and bad breath and supports a healthier smile once treatment ends.
Good habits built during treatment tend to carry over afterward, which is one reason a steady daily routine matters as much as any single cleaning product.
Can mouthwash be used to clean aligners?
It is best to avoid soaking aligners in mouthwash. Many mouthwashes contain dyes or alcohol that can stain or damage the plastic over repeated use, even when the rinse itself is safe for teeth and gums. Sticking to clear soap, cool water, or an approved aligner cleaning product keeps the trays in better condition without adding that risk.
A dentist can also recommend a specific cleaning product if a patient notices persistent cloudiness or odor despite a consistent routine, since not every case responds the same way to general advice.
Sources and further reading
Editorial note: This article is for general educational purposes and is not a substitute for an examination, diagnosis, or treatment plan from a qualified health professional.
