Unsightly metal fillings can be replaced in an aesthetic tooth coloured material, commonly known as white fillings. The advantages of this material is that it bonds to the tooth which means no excessive removing of a natural/healthy tooth.
Most people have fillings of one sort or another in their mouths. Nowadays fillings can be natural looking. Many people are more conscious about the way they look, so they don't want silver fillings that show when they laugh or smile.
It is usually best to change fillings only when your dental team decide that an old filling needs replacing. If so, you can ask to have it replaced in a tooth-coloured material.
Some dentists prefer not to put white fillings in back teeth, as they are not always successful. One way around this would be to use crowns or inlays, but this can mean removing more of the tooth and can be more expensive.