Why Do Aligners Turn Cloudy - and Does It Actually Matter?

Your aligner turned cloudy? Spoiler alert - it happens to everyone. But what to do about it depends on where you are in treatment.

Two situations, two answers

• During treatment: trays swap out every week or two, so a bit of haze is temporary
• After treatment: your retainer stays with you for months, so keeping it clear matters more

During treatment: clean it daily anyway

• Rinse with warm (not hot) water every time you take it out - clears the saliva before it dries
• Brush gently with a soft brush and mild soap, daily
• Deep-soak with aligner tablets 1-2 times a week - not daily, overuse can wear the plastic

Finished treatment? Still clean it daily

Worn only at night, your retainer still collects bacteria. Same routine applies - rinse, gentle brush, weekly soak. It's with you for months, so the extra care is worth it.

What speeds up cloudiness

Regular toothpaste is the biggest avoidable cause - the abrasive particles create microscopic scratches that scatter light, and the haze is usually permanent. Dried saliva left behind also builds a thin mineral film over time.

What actually works best (our ranking)

1. Gentle brush + mild soap daily, tablets 1-2x a week
2. Foam or spray - handy on the go, a supplement not a fix
3. UV sanitizer - disinfects, but won't clear cloudiness on its own

Does cloudiness matter for your health?

During active treatment, the real risk is low - trays are replaced often. But on a long-term retainer, a cloudy tray often means biofilm is building up, which research links to a higher risk of cavities and gum irritation, since the tray traps bacteria against the tooth.

The red flag: bad smell or visible staining means it's time to clean - and never store an aligner wet.

Sources: 80 Twenty (2026), SmileHaus Orthodontics (2023), Smile Center (2026)