A number of stains often develop on partial dentures, including calcium deposits. These deposits come from build-up and mineral deposits that accumulate and settle on the dentures during regular use. To remove the calcium deposits, you want to use something natural and nontoxic. There are many chemicals that could remove the deposits, but since these dentures are going back into your mouth at some point, you want to use natural removal products that will not harm you or the dentures.
Fill a bowl with white vinegar, using enough to submerge the dentures.
Place the dentures in the bowl, and let them soak for about an hour.
Remove the dentures and scrub with a wet toothbrush.
Rinse the dentures with warm water to remove any leftover vinegar solution and allow to air dry.
Do not put dentures in hot water, which can cause them to warp.