How do I remove stains from clear-aligner trays?

For removing stains from clear-aligner trays, the simplest safe approach is a manufacturer-approved aligner soak or a gentle cleaning with a soft-bristle brush and mild, non-abrasive soap, followed by a thorough rinse. [1, 4]

Quick takeaways

• Use a recommended aligner soak (diluted cleaning crystals/tablet) or mild soap + soft brush, then rinse.
• Avoid whitening toothpastes, harsh oxidizers/bleaches and hot water; these can change colour or surface texture.
• Dark drinks like coffee stain most; some stains may not fully reverse with cleaning in lab tests.
• Log cleaning sessions in Smilo so you can track routine and set reminders for regular cleanings. [1, 2]

Safe, practical stain-removal steps

Daily or routine: use a soft-bristle toothbrush with clear, mild, non-abrasive soap and lukewarm water to gently brush trays, then rinse thoroughly. Periodic soak: follow your aligner-maker’s instructions (for example, dilute aligner-cleaning crystals or an approved tablet and soak for the recommended time), then rinse thoroughly before reinserting. [1, 4]

• Brush gently with a soft brush and mild soap; do not use abrasive pastes.
• Soak occasionally with manufacturer-approved cleaning crystals or tablets per packet directions and rinse.
• Rinse thoroughly before reinserting trays. [1, 4]

What to avoid and why

Do not use whitening toothpastes or abrasive cleaners: a randomized crossover clinical trial found whitening toothpastes and some cleaning protocols were associated with greater perceivable colour change and increased surface roughness on aligners. [2]

Avoid hot water and harsh chemicals (strong oxidizers/bleaches): professional patient guidance for removable appliances warns these can damage fit and clarity. [4]

How well cleaning removes heavy stains

Laboratory studies that intentionally stain aligner material (for example with coffee) show dark beverages cause the largest staining and that some cleaners reduce but often do not fully reverse staining under in-vitro conditions. [3]

Those lab tests model a worst-case continuous immersion and do not precisely predict how quickly or how much staining builds up with typical intermittent drinking. [3]

Using Smilo to keep tray cleaning consistent

If you want to keep a regular cleaning routine, Smilo can log each aligner cleaning session and let you set configurable reminders for regular cleanings so it’s easier to stick with a gentle daily brush plus periodic soak schedule.