Acrylic bridges will gradually turn yellow over time, and unfortunately this is due to the material, as acrylic is porous and susceptible to staining. Because of this, the majority of acrylic bridges are purely temporary, and even though they can last for several years they are very rarely meant to. Once the acrylic has become stained there is no way of removing this staining to lighten the shade. The easiest thing to do is to have the bridge remade, and if possible choose a material which will not change colour. The best material for a bridge is porcelain, as the colour doesn’t change and porcelain doesn’t stain as it isn’t porous.
Most acrylic bridges can be remade as permanent porcelain bridges, and there are lots of different materials to choose from, depending on the retaining teeth and their placement in the mouth. If the bridge is to replace anterior teeth, then the best option is probably to use an all ceramic bridge which doesn’t contain any metal. This type of bridge is ideal, as it creates a good level of translucency which mimics the natural teeth, giving an aesthetically pleasing and natural restoration. Most people will not know you have a bridge if the work has been completed by a skilled dental surgeon using a top quality dental laboratory.
If the bridge is to replace posterior teeth, then it may still be possible to use an all ceramic bridge as most modern materials are extremely strong. However if someone has a heavy bite or is liable to grind their teeth then they may be better off having a bridge which incorporates some metal. Metal bites stops on the biting surfaces will protect the porcelain from fracturing, prolonging the life of the bridge.
There are some bridges which are made out of pink gum colored acrylic and denture teeth, and if these denture teeth have become discolored then it made possible to replace the denture teeth with newer teeth which might be slightly more resistant to staining. It is possible to use porcelain teeth on dentures, but these porcelain teeth are much more prone to falling out or cracking than standard acrylic denture teeth, even though they look much more natural. Some people prefer having acrylic crowns and bridges fitted as they are a lot cheaper than porcelain crowns. The trouble is that although it may save money in the short term, acrylic tends to be a lot less durable than porcelain, and it can end up being a false economy. Wherever possible, porcelain is definitely the better option.