Many people have fillings of one sort or another in their mouths. Nowadays fillings are not only functional, but can be natural looking as well. Many people don’t want silver fillings that show when they laugh or smile because they are more conscious about the way they look.
It is usually best to change fillings only when your dentist decides that an old filling needs replacing and only if your dentist says the tooth is suitable for white filling material. If so you can ask to have it replaced in a tooth-coloured material.