Dentures cannot be safely whitened by the wearer, but regular cleaning with approved products may help prevent staining according to MayoClinic. As a manufactured product, dentures are not as strong as regular teeth and should be cleaned with care.
Dentures are made of plastics and cannot be whitened with over-the-counter toothpastes or soaks, which are too abrasive. Dentures should be brushed every day with a soft-bristled toothbrush or a denture brush to remove food particles, plaque and bacteria. Scrubbing gently with denture cleaning products prevents dentures from becoming permanently stained, and it also helps keep the wearer's mouth healthy and fresh.
The American Dental Association (ADA) suggests that users speak with their dentist about proper care for dentures. The dentist may recommend a particular type of regular toothpaste that is safe to use on denture material, denture cleaning paste or a denture soak. A mixture of hand soap or dishwashing liquid and warm water applied with a soft toothbrush is also a possible solution for light staining. While a diluted bleach mixture is suggested by some, the ADA warns that bleach may whiten the pink portion of dentures and damage them.
It is important that wearers follow the manufacturer directions and the instructions of their dentist regarding soak times for dentures. It may be necessary to take dentures with deep stains to a prosthodontist.